Features DOUBLE SALINOMETER: The water quality tester detect the salinity of fresh water. At the same time, the salinity of seawater can be measured. Food salinity measurements range from 0.00‑25.00%(you have never supervised your food). PH METER: Temperature affect reading levels and the automatic temperature compensation of the water meter ensure you get the most accurate reading possible. 7 IN 1 WATER QUALITY METER: Can measure PH, TDS, EC, ORP, S.G, salinity, temperature, the measuring range is large and wide. Small and versatile, ideal for home and laboratory pH testing applications including drinking water, swimming pools. REDOX POTENTIAL(ORP) TESTER: ORP is a common, simple, and direct measurement that quickly indicate the degree of oxidation or reduction of water. By regularly monitoring ORP levels, effectiveness can be monitored and water treatment plans. MULTI PURPOSE WATER POLLUTION TESTING: Portable TDS and EC meter can be carried anywhere to measure water quality, such as tap water, RO system water, aquarium, sea water and pool water. Specification: Item Type: Bluetooth Water Tester Material: ABS Battery: 4 x LR44(not included) PH: 0.00-14.00pH, Accuracy: 0.01pH ORP: -2000m~+2000mv EC: 0-19900us/cm, 0-199.0ms/cm TDS: 0-19900ppm, 0-199.0ppt SALT: 0-199.0ppt, 0-20% S.G: 0.990-1.400 Temp: 0℃-50℃(32℉-122℉) Package List: 1 x Bluetooth Water Tester 1 x User Manual Package List 1 x Bluetooth Water Tester 1 x User Manual