Professional 4 in 1 PH/TDS/EC/Temperature Meter Digital Water Quality Monitor Tester for Pools, Drinking Water, Aquariums, laboratory, industrial, sewage treatment, scientific research, pharmaceutical, electroplating solution, tap water, aquaculture, drinking water, enzymes, well water, sea water, boiler water, fish tank water, swimming pool water, photographic rinse, ink, food processing , Ionized water, household water quality testing, physical and chemical teaching, cosmetics, human urine PH value. Wholesale 4 in 1 PH/TDS/EC/Temperature Meter.