Since water is the basis of life and we, due to the peculiarities of our physiology, have to consume it without fail, it would be nice to be able, if not at a professional, then at least at a household level, to assess its quality. An inexpensive device from a fairly well-known Chinese manufacturer - Xiaomi MI will help in this. TDS Pen. What kind of tester is this and how it works - this will be our conversation.
What is being measured?
One of the most important indicators of water quality is the degree of its mineralization. This term refers to the amount of various inorganic impurities - individual trace elements and their compounds, per unit volume of liquid. A special case is the so-called hardness salts, which are commonly called calcium and magnesium compounds. When water is heated, they partially crystallize and are deposited in the form of scale, which we can see in the kettle and on the heating elements of boilers and washing machines.
Not only hardness salts, but also other mineral impurities, and these include heavy metals that are notorious today, with an excess content, have a negative impact on the health of the consumer. One of the most striking examples is the formation of kidney and bladder stones. There are other violations:
- deterioration in the condition of the hair;
- tooth decay, etc.
Therefore, it is extremely important to have data on the degree of mineralization of drinking water consumed over a long period of time.
In our country, the content of mineral impurities is usually measured in milligram equivalents per liter (mg-eq / l). Abroad, this parameter is called Total Dissolved Solids (TDS), which translates as "total content of dissolved solids." The TDS of water is measured in units of “Parts per million” (PPM), which translates as “parts per million”. Xiaomi TDS water tester, which is described in this material, shows the degree of mineralization in these units. The ratio of domestic and "imported" units of measurement is as follows: 1 meq/l = 50.05 PPM.
What is considered normal
The requirements for the degree of mineralization of drinking water are prescribed in the document SanPiN (sanitary rules and norms) No. 2.1.4.1074-01. According to him, the concentration of mineral impurities should not exceed 7 mg-eq / l, which is equivalent to 350 PPM. On the box in which the Xiaomi MI TDS Pen TDS water quality tester is packed, there is a “Water Quality” table with the following gradation:
- Up to 50 PPM: water that can be conditionally considered distilled. It is obtained using reverse osmosis plants and distillers. Some experts do not recommend drinking water with low mineral content, believing that it can greatly disrupt the electrolyte and salt balance in the body. But this point of view has not yet been proven and it has both supporters and opponents. We will not delve into the scientific jungle, but we note that he drank distilled water and was recommended to drink by the well-known promoter of a healthy lifestyle, Paul Bragg. As you know, he drowned at the age of more than 80 years while surfing, which in itself indicates remarkable health.
- Between 50 and 170 PPM: pure water, which can be found in some natural sources or obtained using a charcoal filter.
- Between 170 and 300 PPM: hard water, which can be considered limited.
- Between 300 and 600 PPM: Extremely hard water not recommended for drinking.
- Between 600 and 1000 PPM: Not only is the water harmful, it also has a noticeable bad taste.
- Above 1000 PPM: the water is not suitable for continuous drinking.
Description of the device
The Xiaomi water tester looks like a marker or an electrothermometer. On the ends there are caps:
- a container for batteries is hidden under one of them;
- under the other - a temperature sensor and two titanium electrodes (they have anti-corrosion resistance).
The cap on the side of the sensors is designed in such a way that water can be scooped into it.
In the middle part of the body there are:
- small display;
- power button (on / off);
- button labeled "TDS" (taking measurements);
- a clip with which the device can be hooked onto a patch pocket.
The case itself is made of shiny plastic. These materials are known to scratch quite easily, so you would expect this TDS meter to wear out relatively quickly. But with its cost - from 5.3 USD on the official website to 7.7 USD in some online stores - this drawback can be considered quite tolerable.
In its action, the Xiaomi TDS water tester is similar to a conventional ohmmeter: it determines the electrical conductivity of water, for which a voltage of several volts is applied to the electrodes immersed in it. Pure distilled water is known to be a dielectric. And some impurities present in the form of ions give it the ability to conduct electricity. The higher the content of these impurities, the lower electrical resistance water.
The water analyzer detects the following substances:
- Salts of calcium, magnesium and other alkaline earth metals.
- Ions of heavy metals - lead, chromium, copper, zinc, etc.
- Some organic impurities, such as ammonium acetate.
As you can see, the list is quite modest, especially when compared with professional analysis: in Western European countries, drinking water is tested according to 60 parameters, in the USA - according to 90. Thus, the Xiaomi MI TDS Pen water tester cannot be considered as a means for a full-fledged quality check water - bacterial contamination, benzene, cadaveric poison and many other toxic substances are not identified by him.
This device is a TSD factor meter. If you need to check the water, for example, from a well, you should contact a specialized laboratory.
AlthoughXiaomi TDS water tester is equipped with a temperature sensor, it does not display the temperature. This sensor is needed in order to correctly determine the PPM indicator, because water with the same salt concentration at different temperatures will have different electrical conductivity.
The temperature accounting function is referred to as "Auto Temperature Compensation". If it were not there, then in order to obtain accurate readings, the water under study would have to be heated or cooled to certain temperature, say, at + 200C.
Read also
Specifications
Tester dimensions: 150x16x16 mm.
Weight: 27.4 g
Battery type: push-button, AG13 or LR44, with a voltage of 1.5 V and a total capacity of 160 mAh (2 pcs.).
Measurement accuracy: within 2%.
The temperature of the test water, at which the measurement error does not exceed 2%: from 0 to +800C.
How to use the device?
Using the TDS meter is extremely simple: turning it on, you need to immerse the sensors in water or scoop it into the cap, and then press the "TDS" button. At the same time, a number will light up on the display, showing the concentration of impurities in PPM units. The reading will fluctuate at first, but after a few seconds the final value will be set.
The matrix is designed for three digits, but if the indicator exceeds 1000 PPM, then the additional “x10” icon will light up (multiply by 10). Thus, the water tester can objectively display the degree of mineralization up to and including 9990 PPM.
If the device is idle for 2 minutes, it will turn itself off.
Who needs a water tester from Xiaomi
This device will help determine the suitability of water for:
- eating;
- filling the aquarium;
- applications in appliances such as irons (steamers), steam generators and ultrasonic humidifiers.
It will come in handy both for people who do not use filters, and for those who have such installations: with the help of a water tester, you can accurately determine whether it is time to change the cartridges.
Video review
It is believed that if the mineralization of water after filtration is 8-10 times lower than before it, the cartridges are fully functional.
A separate issue is hardness salts. Many mistakenly believe that you can get rid of them by boiling. In fact, only magnesium and calcium bicarbonates turn into hard scale. Chlorides and sulfates remain in solution and enter the body. Therefore, even after boiling, the TDS of water is desirable to control.
You should not think that the problem of excessive mineralization is relevant only for residents of large cities, which are supplied with water from surface reservoirs. Any natural source, regardless of proximity to industrial regions, can be overmineralized.
Even artesian water in some regions contains a large number of some elements, for example, iron, which requires iron removal measures before eating. Water in a mountain stream may well have a TDS of over 1000 PPM (one of the Xiaomi MI TDS Pen users was convinced of this), so this device will also come in handy for tourists.
Do you need such a device? Leave your opinion in the comments!
Xiaomi Mi TDS Pen is a product of a very well-known Xiaomi company in our country. This is a water tester for the content of solids (mineralization) in it. "Xiaomi products will continue to improve your quality of life!" is a beautiful and inspiring slogan of the company, and you can buy the Xiaomi Mi TDS Pen water tester in our online store with delivery.
How does a water quality tester work
Clean water is becoming one of the main values on the planet. We all know that the drinking water that flows from our faucet is difficult to trust. Xiaomi Mi TDSPen is a device capable of measuring the concentration of particulate matter. This concept includes salts (ions of calcium, magnesium, sodium, and other metals), as well as impurities of ammonium acetate, sulfates, organic compounds, heavy metals (Cr, Zn, Pl, Cu) and their ions.
Xiaomi Mi TDS Pen water tester measures TDS. This English abbreviation stands for Total Dissolved Solid, literally "amount of dissolved solids". The TDS indicator is displayed in ppm, that is, parts per million, the number of impurity molecules per milligram / liter. The measurement range of PPM in our drinking water tester varies from 0 to 9990. For those who are interested, ppm is translated into water hardness indicators accepted in our country as 0.02 meq / l.
We will also give a list from which it will become clear how to determine the quality of water.
- 0-5 ppm - unnecessarily "clean" water, this is also not recommended for drinking (yes, healthy water should be slightly mineralized).
- 50-100 - the best water for health, equivalent to spring, filtered, (purchased bottled should be within these limits).
- 100-300 - drinking water with safe mineralization, what should be in our water supply.
- 300-600 ppm - drinking water, not recommended for consumption.
- From 1000 - water, harmful to health.
How to use the tester
The shape of the tester is similar to a pen, which is clear from the name Xiaomi Mi TDS Pen. Length 150 mm, diameter 16 mm. The measuring element is made of titanium. The tester is powered by two AG13 batteries (tablet). The body is completely sealed.
The device is very easy to use. You just need to lower the Xiaomi Mi TDS Pen into the water to be tested and press the button. The TDS reading will be displayed on the small LCD display. The tester will automatically turn off after 2 minutes.
Water purity tester
- Convenient shape
- Accurate results
- Economical battery consumption
The quality of the water we drink affects the functioning of the whole organism. Unfortunately, we cannot determine by taste, color and smell whether the water is drinkable. But the Xiaomi Mi Water Quality TDS Pen Tester will do it for you. It is similar in size and shape to a pen, so you can always carry the tester with you.
The device determines the TDS in water. TDS (Total Dissolved Solids) is the total mineralization or the total amount of dissolved particles. Its level should not exceed 600, but the lower the TDS, the better the quality of the water. High level mineralization means that inorganic salts, minerals and heavy metal ions are dissolved in the liquid.
TDS and water purity
0-50 _______________ Perfectly pure water
50-100 _______________ Water is considered relatively clean and drinkable
100-300 _______________ Satisfactory purity
300-600 _______________ Water contains a large amount of impurities
1000 or more _________ Drinking water is life-threatening
Check for three types of impurities
inorganic salts
organic matter
heavy metal ions
Test water wherever you need it
Xiaomi Mi Water Quality TDS Pen Tester can be taken to work or on a trip to check the water quality. It is known that in different regions tap water has different indicators, you can never be sure that you are offered a quality drink. Even water filters sooner or later become clogged and cease to perform their function. You can only trust smart electronics!
By the way, customers who decide to buy Xiaomi Mi Water Quality TDS Pen Tester from us use it not only to test drinking water. For example, home plant lovers check the quality of the irrigation liquid - there the level of general mineralization should be high. Some control the purity of the water in the aquarium. In a word, the functions of this device are very wide.
tap water
Boiled water
Bottled water
Water in public places
Water for watering plants
Aquarium water
High technology for precise results
input
The body of the Xiaomi Mi Water Quality tester is protected from water, even if you drop it into a liquid, nothing bad will happen. At one end is a titanium probe, as well as the TDS measurement sensor itself. By the way, the device takes into account the temperature of the water in its measurements in order to eliminate errors.
The device runs on two batteries. In order to save energy, the tester turns itself off after 2 minutes after being turned on.
Runs on two batteries
Shows from 0 to 9990 PPM
Automatically turns off after 2 minutes of standby
Compact size
Takes into account water temperature
The probe is made of stainless titanium
Cap for sampling water
Housing protected from moisture
Energy Saving Technologies
Rapid water testing
Just click the button
To find out the level of water contamination, simply draw a small amount of liquid into the cap, insert the tester and press the button. A clear number will appear on the monochrome screen - this will be the TDS indicator.
Works perfectly in conjunction with the Xiaomi Mi Water Purifier
To always have clean water in your home, use Xiaomi Mi Water Purifier. With the help of a tester, you can check at any time that the cleaner is working correctly, and you will also understand in time that it is time to change the cartridge.
The quality of the water we consume is of great importance for a healthy lifestyle. Only a laboratory analysis can give a complete picture of this. Recently, however, easy-to-use testers have appeared that allow you to easily and quickly assess the quality of drinking water at home. They are called TDS meters and measure the concentration of foreign substances dissolved in water. The description of one of these devices is the subject of our review.
What is a TDS Meter?
The English abbreviation TDS stands for Total Dissolved Salts, which can be translated into Russian as "total salt content". Since TDS meters (testers) are mainly focused on measuring the concentration of dissolved solids in water, they are often called "salt meters".
The presence of foreign insoluble impurities in the water is quite simply determined by eye by the transparency of the water. However, it is not possible to assess in this way how high the content of dissolved substances is in transparent at first glance water. As a rule, these are mineral salts, salts of alkaline earth metals, as well as a certain amount of organic substances.
There is a simple, accurate, but time-consuming method for determining the amount of substances dissolved in water. To do this, evaporate the water and weigh the remaining dry residue. This will be an indicator of the total content of substances dissolved in water, denoted by the English term TDS. The presence of a saline meter makes it possible to do without this lengthy procedure and mathematical calculations of the impurity concentration.
The principle of operation of such a device is simple - it measures the electrical resistance (conductivity) of drinking water, which depends on the concentration of substances dissolved in it.
According to World Health Organization standards, drinking water should not exceed a TDS of 600 mg/l. According to Russian standards, drinking water should contain no more than 350 PPM of dissolved impurities, and according to European standards - no more than 150 PPM. In this regard, you can find various recommendations on the suitability of water for drinking.
In practice, to assess the quality of water in terms of PPM, it is most convenient to use the diagram given on the website FilterWater.com of a well-known American manufacturer of water treatment equipment:
You can also use the following table:
| 0-5 PPM | Distilled water that does not contain salts. Not recommended for drinking. |
| 5-50ppm | Crystal clear water is also not recommended for permanent consumption. |
| 50-100ppm | Pure water drinking water, water from mountain springs. |
| 100-300 PPM | Ordinary tap water and water from artesian wells, which can still be drunk without harm to health. |
| 301-600 PPM | Water with a high content of dissolved substances with a specific taste in old and worn plumbing systems. |
| 600-1000 PPM | Dirty water with a critical solids content with an unpleasant taste and odor. |
| 1000 PPM and above | Water hazardous to health. A high level of mineralization can be associated not only with the content of potassium, sodium and hydrochloric acid salts, whose ions have a small and short-term effect, but also with the presence of toxic ions of lead arsenide, cadmium, nitrates, etc., hazardous to health. The exception is special therapeutic mineral salts. |
Household TDS - a compact device in size and appearance like an electronic thermometer. To determine the general mineralization of water, it is enough to lower its electrodes into a vessel with water and after a few seconds the value of the mineralization of water in PPM units will appear on the display.
It is important to note that for simplicity and ease of use, you have to pay for the accuracy of measurements, since the tester is tested at the manufacturer with a solution of sodium chloride. However, at home, such averaging is quite acceptable.
Scope of water testers (TDS-meters)
The main purpose of these devices is to measure the quality of drinking water at home. Water test results from faucet allow you to assess how urgent it is to use home filters before drinking such water. In the future, testers make it possible to evaluate the performance of home filters, change their filter elements in a timely manner, since manufacturers' recommendations on the timing of their replacement are very approximate (often they have to be changed more often than recommended by the manufacturer).
Unfortunately, when describing TDS meters, dishonest marketers often mislead potential buyers by giving false information about the capabilities of this device. In advertising brochures, you can read that the devices are used to measure the hardness of water.
The hardness of water depends on the concentration of alkaline earth metal salts in it, mainly calcium and magnesium. The higher the concentration of these salts in water, the harder it is. Water hardness is of great importance for aquarists, as well as for growing seedlings and watering houseplants. However, TDS meters only measure the total content of all substances dissolved in water, and not just calcium and magnesium salts. The exact hardness of water can only be determined chemically. In domestic conditions, special chemical kits or test strips are used for this, by changing the color of which one can judge the degree of water hardness.
The tester is intended primarily for home use. In field conditions, the results of measurements made with its help do not allow one to unequivocally determine how suitable for drinking water taken from natural sources (streams, rivers, lakes). Firstly, the tester measures the presence of only a limited set of substances in water, and secondly, it does not allow determining the presence of pathogenic microbes in it.
Overview of the appearance of the Xiaomi Mi TDS PEN TDS meter
This device was developed by a relatively young (founded in 2010) Chinese company Xiaomi Mi, which produces various electronic devices, computers, media centers, mobile phones, audio accessories, power supplies, sports devices (pedometers, heart rate monitors, heart rate indicators, etc.), various household appliances and much more.
The XIAOMI MI TDS PEN tester is sold in a neat cardboard box, in which, in addition to the device itself, there is some kind of cardboard with inscriptions in Chinese.
On the reverse side The box contains drawings explaining the use of the tester and the captions under them in Chinese.
However, on the Internet, you can download the user manual in English (files.xiaomi-mi.com/files/TDS_pen/ /TDS_pen_EN.pdf) and Russian (files.miui.com.ua/files/Files/Instruction/Tester water quality/TDS pen EN.pdf).
The TDS tester itself resembles an electronic thermometer in appearance and size. Its dimensions: length - 15 cm, thickness - about 16 mm, weight - about 30 grams.
The body of the tester is made of plastic using injection molding technology, and the measuring probe is made of titanium, which is not subject to corrosion. The device is also equipped temperature sensor, which eliminates the effect of temperature on measurement accuracy in the range from 0 to 80°C.
The main parts of the design: A - measuring compartment with two electrodes and a temperature sensor; B - display and power button; B - battery compartment (2x)
The measuring compartment with electrodes and temperature sensor is closed with a translucent protective cap (A). It can be used as a small container for testing water. On the other side of the body (B) there is a battery compartment for two LR44 button-type batteries (supplied with the tester). Near it is a display of measurement readings and an ON / OFF button (B).
For salinity values above 999 PPM, the display will show the “x10” icon, which indicates that the displayed value must be multiplied by 10.
Water quality measurement with Xiaomi Mi TDS PEN TDS meter
The main purpose of the TDS meter is to check the quality of drinking water from the water supply, after boiling in electric kettles, at the outlet of household cleaning filters.
The XIAOMI MI TDS PEN tester allows you to check the water quality for the content of three types of impurities:
- soluble salts (sodium, calcium, magnesium, etc.);
- ions of organic compounds (ammonium acetate, sulfates, etc.);
- heavy metal ions (chromium, zinc, lead, copper, etc.).
The measurement process itself is very simple:
- Collect the water to be tested in some container, which can be used as a protective cap, filling it 3/4. The water must be shaken to remove air bubbles from it. The water temperature should be no more than 80 degrees.
- Turn on the device by pressing the button and immerse the electrodes in the container with the water to be tested.
- Within about 3 seconds, the display will show the value of mineralization (salinity) of water.
- After completing the test, dry or wipe dry the tester cap and the electrode compartment. Close the cap of the tester and turn off the instrument power.
| Low level | Relatively low level | lower level | High level | Relatively high level | Dirty water |
| 0–50 | 50–100 | 101–300 | 301–600 | 600–1000 | Over 1000 |
A more revealing interpretation of the measurements is illustrated in the image from the website of the tester manufacturer:
But it is most convenient to evaluate the results of measurements using the Water Quality Diagram and the table given at the beginning of the review.
Notes on maintenance and operation of XIAOMI MI TDS PEN TDS meter
- Do not immerse the device completely in water.
- The tester is immersed in water only at the end where the measuring electrodes are located.
- The tester does not allow you to determine the degree of mineralization of the flowing water (water must be in a container).
- Maintenance of the device consists in the timely replacement of batteries and periodic washing or wiping of the electrodes with alcohol, distilled or deionized water.
Xiaomi Mi TDS pen is an indispensable, easy to operate and very useful device for the systematic monitoring of water quality
Allows you to test your water at home to see if it needs water treatment.
Externally, the device looks like an electronic thermometer. But in addition to temperature, it is able to measure the content of heavy metals in water, organic matter and the salinity of the water as a whole to assess its overall purity.
What is the water quality at home? Test before use!
Initially, xiaomi has been manufacturing software and smartphones, but quickly realized that all sorts of technology brings a good profit went to create devices for the home. In this review, we'll look at interesting thing– Xiaomi Mi TDS water tester pen. Alas, today this device can be considered a necessity for residents of large cities.
We cannot figure out the purity of drinking water with the naked eye, it would seem in crystal clear water
contains a lot of impurities, the TDS value represents the total content of soluble solids in water, Mi TDS can reflect the water quality to a certain extent. Generally, a lower TDS value indicates less presence of water soluble heavy metal salts, thus cleaner and better water quality. Mi TDS Pen detects water quality and can accurately determine the TDS value of water.
Xiaomi Mi TDS Pen despite its functionality has reasonable price when buying in the online store.
What is Xiaomi Mi TDS Pen?
The water contains substances for measuring the total mineralization of water (TDS - total dissolved solids). This means that thanks to the device, you can find out whether and in what size the water contains:
- heavy metals (lead, chromium, copper, zinc);
- inorganic salts (magnesium, calcium);
- organic compounds (ammonium acetate).
- The measurement of the total mineralization of water is in several parts per million or ppm (parts per million).
The World Health Organization (WHO) recommends:
- TDS values below 600 mg/l are generally considered good quality water and recommended to drink
- When the TDS value exceeds 1000 mg/l, there will be a significant change in the taste of drinking water.
To clarify: if Xiaomi Mi TDS pen shows us 250 ppm, it means that millions of water particles contain 250 molecules of unwanted substances. By the way, this is a normal result, relatively safe for the body.
Xiaomi Mi TDS water analyzer pen can measure from 0 to 1000ppm.
There is a special table for decoding the measurement results:
- 0-50 ppm (mg/l) ultrapure water (distilled if possible);
- 50-100 ppm (mg/l) - pure (filtered) water;
- 100-300 ppm (mg / l) - ordinary (tap) water that has undergone initial treatment;
- 300-600 ppm (mg / l) - hard water;
- 600-1000 ppm (mg / l) - hard water is undrinkable, but not poison;
- 1000 ppm (mg/L) is the hazardous liquid value.
Who can use Xiaomi Mi TDS Pen?
It's pretty easy to find practical use water analyzer. The most obvious option is to use a tester to check the quality of filtered water. This is due to xiaomi mi tds pen, you can simply replace the cartridge in the filter jug or reverse osmosis filter.
The thing is, cartridge manufacturers always make recommendations when you need to replace this accessory, but practice (and tester) shows that cartridge sellers care too much about their pockets. Sometimes when using a cartridge, even twice its expiration date, xiaomi mi tds pen shows quite normal ppm water values. At the same time, the recommendations of filter manufacturers are obvious: the more often you replace the cartridge, the more money will fall into their accounts.
You can check ordinary tap water and water from open reservoirs with xiaomi Mi TDS pen. In any case, the manufacturer positions the device as universal. But it is worth considering that if tap water first goes through a certain amount of cleaning and is conditionally considered good for drinking, then water from wells, rivers, lakes and other sources can include a bunch of organic and inorganic substances, bacteria and impurities, which will not be determined in the analyzer. As a result, the tester will show a good result, but the water will be undrinkable. For this reason, it is impossible to consider xiaomi mi tds pen universal tool.
Who else needs a water test tool and why:
- those who live in areas with very hard water, the consumption of which leads to the formation of kidney and bladder stones;
- before pouring water into the iron;
- aquarists add only the right water, purified from hardness salts.
Xiaomi Mi TDS water tester device
The Xiaomi Mi TDS pen resembles an ordinary electronic thermometer, which is closed on both sides of the lid. On one side, lr44 batteries are inserted into the device (they are included in the kit), and on the other side, there are 2 special titanium probes. Titanium provides resistance to corrosion of the instrument and high accuracy.
The analyzer is turned on and off with a single button. For analysis, it is enough to lower the device into a container with water from the side of the probe. The display on the side of the Mi TDS Pen will show the measurement result.
The instrument can be calibrated and is said to be very easy and simple to do. I think that there are still some difficulties - the question remains, where to get the standard for calibration. The only thing that comes to mind is water for injection from a pharmacy, by default, it is ultra-pure, distilled, and therefore well suited for our purposes.
As you know, water temperature always affects the error in determining the mineralization index. To account for this parameter, the analyzer can measure the heating level of the liquid. However, for some reason, manufacturers have decided that users do not need to measure water temperatures, since it is not displayed on the display tester, but simply “take into account”.
So just to keep you informed, here's another example: if you take a hot and cold water from the same faucet in the same apartment, the difference in instrument readings will be about 50-60 ppm. Naturally, hot water will show worse results.
Most likely, the problem is not that xiaomi mi tds pen does not remove errors well due to temperature. There are usually two pipes - one with cold (drinking) water, and the second with hot (as a rule, it is considered technical). In fact, we are talking about liquids with different mineral composition. It is not surprising that the device will show different meanings TDS.
By the way, the water from the reverse osmosis filter shows the content harmful substances about 20-30ppm. After the water pitcher filter, the TDS value is approximately 150-170 ppm (this is normal). Mineral Waters usually show up to 300 ppm this is a fact and minerals, because sometimes you need to use salt, which is good for the body.
Buy Xiaomi Mi TDS water quality tester
Conclusion
That's all cool in this device, but it is still far from perfect. For those who want to control the quality of filtered water, xiaomi mi tds pen is suitable. First you need to measure the mineral and salt composition of water before and after filtration.
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