How to use Xiaomi water tester: a complete guide with the decoding of indicators

Why You Need a Water Tester and How It Works

Xiaomi water quality test (most often Mi models) TDS Pen or ClearGrass TDS Meter has become a popular gadget for monitoring drinking water at home (TDS) — The total content of dissolved salts, metals and other impurities in milligrams per liter (ppm) is a key indicator that helps to assess whether water is suitable for drinking, cooking or use in household appliances (for example, irons or coffee machines).

The principle of the tester is based on conductometry: the electrodes of the device pass current through water, and the resistance of the liquid is converted into digital values. TDS. The higher the concentration of dissolved substances, the better the water conducts electricity, and the higher the readings of the instrument. TDS-The meter does not determine the specific composition of impurities (for example, it does not distinguish useful calcium from harmful lead), but gives an overall picture of contamination.

In this article you will find unique data on the calibration of the Xiaomi tester for Russian realities (for example, how to take into account the hardness of water in different regions), step-by-step instructions for use, as well as a table of decoding indicators. TDS Separately, we will analyze typical errors that distort the measurement results, and give recommendations for the care of the device to extend its service life.

What models of water testers Xiaomi produces

Under the brand Xiaomi and its ecosystem (Mijia, ClearGrass) produced several models. TDS-They're designed, they're precise, they're extras. Here are the main options available on the market:

• 🔹 Mi TDS Pen (Mijia) - Basic model with a measurement range of 0-9990 ppm, automatic shutdown and waterproof housing (IP67). precision ±2%.
• 🔹 ClearGrass TDS Meter - improved version with screen highlighting, extended range to 9999 ppm and the function of retention of readings (HOLD).
• 🔹 Xiaomi Youpin TDS-3 — Premium model with manual calibration, thermal compensation (water temperature) and memory of the last 10 measurements.
• 🔹 Bluesmart TDS Meter is a budget version with a simplified design, but with the same range of 0-9999 ppm.

All the devices are battery-operated. CR2032 (The kit usually comes with 2 pieces) and have a life of electrodes of about 1-2 years with regular use. The main difference between expensive models is thermal compensation, which adjusts the readings depending on the water temperature (without it, the error can reach 10% when measuring cold or hot liquid).

⚠️ Note: Cheap fakes under the Xiaomi brand are often uncertified and overstated. Original devices are sold only through official distributors (for example, Mi Store, AliExpress Official Store) and have a hologram on the package.

Step-by-step: how to use a water tester

Use of the TDS-Xiaomi doesn’t require any special skills, but there are nuances that affect the accuracy of measurements:

1. Prepare the device. Take the tester out of the package, remove the protective cap from the electrodes, check for the battery, and if the screen doesn't turn on, replace the battery.
2. Most Xiaomi models are calibrated in the factory, but if you doubt accuracy, use NaCl (342 ppm) solution to check.

Submerge the electrodes into a NaCl solution (342 ppm) by 2-3 cm|

Wait for the stabilization of the readings (10-15 seconds)|

Compare the value on the screen with the standard (deviation is allowed) ±2%)|

If there is a strong divergence, contact the service center (self-configuration is not provided)-->

Measurement TDS:

1. Pour water into a clean glass (preferably glass or plastic without drawings).°C for minimum error.
2. Submerge the electrodes in water to a depth 2–3 see, without touching the bottom or the walls of the tank. Press the button. ON/OFF (or TEMP heat-compensated).
3. Wait for the numbers to stabilize on the screen (usually 5-10 seconds). If the value jumps, move the air bubble removal device slightly.
4. Write down the result. On models with function. HOLD You can record the readings with a button.

Completion: After measuring, shake the droplets of water off the electrodes, wipe them with a dry napkin and cover them with a protective cap. If the device is not used for more than 5 minutes, it will automatically turn off.

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To check the water from the tap, let it stand for 2-3 minutes - this will allow chlorine to evaporate, which can distort the readings. TDS.

Decoding of indicators TDS: What do the numbers on the screen mean?

Values obtained TDS It should be interpreted in accordance with the SanPiN standards. 2.1.4.1074-01 (for Russia) and WHO recommendations: The following table provides indicators and recommendations for water use:

Important: norms TDS For example, in Moscow and St. Petersburg, tap water is typically 200-400 ppm, and in Krasnodar Krai it is up to 600 ppm due to its high calcium content. For an accurate assessment, compare your readings with the local water utility (you can find them on official websites).

Typical errors in measurement TDS and how to avoid them

Even the original Xiaomi tester can give inaccurate results if you violate the rules of use.

• 🚫 Measurement in dirty dishes: Residues of detergents or fat on the walls of the glass distort the readings. Use only a chemically neutral container (for example, a laboratory glass or a new plastic bottle).
• 🚫 Touching electrodes with your fingers, and the fat and sweat from the skin creates a film that reduces accuracy.
• 🚫 Measurement of hot or ice water: Optimal temperature - 20-25°C. Pri. >40°C has a 15% error. Cool the boiled water before the test.
• 🚫 Ignoring air bubbles, they create resistance and they lower the reading. Shake the glass slightly before measuring.
• 🚫 Storage without a cap. Electrodes oxidize in air, which leads to inaccurate data. Always close the device after use.

Another common problem is contamination of the electrodes, and if they have a white coating, clean them with a soft toothbrush soaked in a solution of citric acid (1 tsp per 100 ml of water). Do not use abrasives or alcohol!

⚠️ Note: If Xiaomi tester shows 0 ppm in tap water, it is a sign of malfunctioning of the electrodes or discharged battery. In nature, zero-mineralization water does not exist (even in the distillate there are traces of substances).

Comparison with other methods of water testing

TDS-The meter is not the only way to measure water quality, so let's look at the pros and cons of water, and look at the alternatives:

For home use, Xiaomi TDS-It can be used in conjunction with test strips: for example, first measure the total mineralization, and then check the hardness and chlorine levels in strips. It makes sense to do a laboratory analysis 1 time per year to check for heavy metals and microbes.

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TDS-Xiaomi meter does not replace a full water analysis, but it helps to quickly monitor the effectiveness of filters and detect sharp changes in quality (for example, after pipe repairs).

Tester care and extension of service life

With proper treatment TDS-Xiaomi meter will last 2-3 years:

• 🔋 Battery, replace the element. CR2032 Every 6 to 12 months, even if the device is working, the battery is running out of power.
• 💧 After each use, wash them with distilled water (you can buy them at the pharmacy) and dry them in the air for 1-2 minutes before closing the cap.
• 🧴 Storage. Keep the appliance in a dry place at 0-40.°C. Avoid direct sunlight.
• 🧪 Calibration: Every 3 months, check the accuracy with a solution of NaCl (342 ppm) or special calibration liquids (sold in aquarium stores).

If the electrodes are covered with black coating (oxidation), try to restore them:

1. Prepare the solution: 1 part vinegar (9%) + 1 part water.
2. Load the electrodes for 10 minutes.
3. Rinse with distilled water and dry.

If the readings remain unstable after cleaning, the electrodes must be replaced. ₽.

Frequent questions about Xiaomi water testers