The Xiaomi TDS water quality test pen can measure the TDS (Total Dissolved Solids) concentration in water. The dissolved solids include any salts, minerals, metals, cations or anions dissolved in water, so the lower amount of these solids, the purer the water. The TDS level is measured in parts per million (ppm) or mg/L and the ideal TDS reading for drinking water should be less than 300ppm. The Mi TDS pen is quite easy to use, it includes two button cells already, so it's ready to use out of the box. You will just need to take the pen cap off, place the head of the pen under water, then the TDS reading will immediately show up on the display. Product Features: ● Food grade PP, titanium metal material. ● Detect the purity of the water by just putting the purity tester in water. ● IPX6 waterproof and has automatic temperature calibration and precision in measurement. ● Highly efficient and accurate due to its advanced microprocessor technology. ● Meters can be re-calibrated with a mini-screwdriver. ● Reacts to organic compounds, heavy metals and soluble salt content. ● Saves measurements for convenient reading and recording. ● Shuts off automatically after 10 minutes of non-use to conserve batteries. ● Measurement range is from 0 to 9990ppm, the resolution is in increments of 1ppm. From 1000 to 9990ppm, the resolution is in increments of 10ppm, indicated by a blinking 'x10' image. ● Comes with large and easy-to-read LCD screen. ● Calibrated with a 342ppm NaCl solution, includes a TDS chart sticker on the back of the meter that explains TDS values. The $6.90 Mi TDS pen on GearVita is an indispensable, easy to manage and very useful device for the systematic monitoring of water quality, it also determines whether purification is required: https://gearvita.com/xiaomi-tds-water-quality-test-pen.html Top sellers on our website: cheap xiaomi airdots headset best lenovo z5 pro 64gb
