The detection pen features the Xiaomi logo. It is all white, and the head cap is translucent. Users will read the TDS water values on an LCD display located on the middle upper position of the pen. It comes with a detection sensor, which basically functions when a metal goes into contact with the water being tested. The gadget is powered by means of two batteries located on the rear. Inside the battery compartment is the Xiaomi logo. The reading will stabilize in about three seconds of testing the water with this gadget. It measures water quality on parts per million scale. TDS means total dissolved solids, the amount of mineral and water salts in water. The water quality detection pen is used to detect how bad water is in regard to quality and in relation to expected standards. For instance, typical bottled water should be around 1ppm. Can tester the soluble solids in the water, TDS value can be proved to a certain extent of your water quality - lower/purer~
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