This is a digital TDS meter tester to test the filter water quality purity,to check the performance of your water filter, to check for hardness ,to make sure you always drink pure water.Saves measurements for convenient reading and recording New Arrival Can be used in: Water purifiers and filters, food(vegetable, fruit &drink quality monitoring, pools and spas, aquarium, hydroponic.Advanced Instruments Tds EC Temperature MeterTDS,EC,Temperature Water quality test pen used to test the water TDS value, water conductivity, in order to judge the degree of pure water, with both test temperature and the environment is the function of temperature,products can be widely applied to water treatment industry, drinking water industry, family, individual stay-cation, field operation as drinking water quality inspection tools. If you are looking for a Super Accurate and Reliable Meter, this is the one for You! Product Original Picture And Video