This 4in1 water tester is lightweight and portable, allowing you to easily carry it around in your pocket, whether you are at the pool, on a trip, at the beach or camping. Simple operation, you just need to immerse the electrode of the tester in the solution and wait for a few seconds to obtain the data on the LCD screen. Two specifications are optional, and you can choose SALT-785H or SALT-785 depending on your requirements. Wide applications, suitable for domestic water, aquarium, aquaculture, catering food industry, fishery, swimming pool. SALT-785H: Support testing SALT, EC, S.G. and temperature. SALT-785: Support testing SALT, TDS, S.G. and temperature. Specifications: Name: Water Tester Material: plastics Battery: 3 * 1.5V AG-13 button battery ( Not Included ) EC: 0-19900us/cm 0-199.0 ms/cm (SALT-785H) TDS: 0-19900ppm 0-199.0ppt (SALT-785) SALT: 0-10000ppm 0-199.9ppt S.G: 0.990-1.400 Temp: 0-80C(32F-176F) Resolution: EC: 1us/cm(<1000us/cm) 10us/cm(>1000us/cm) 0.1ms/cm (SALT-785H) TDS: 1ppm(<1000ppm) 10ppm(>1000ppm) 0.1ppt (SALT-785) SALT: 1ppm(<1000ppm) 10ppm(>1000ppm) 0.1ppt S.G: 0.001 Temp: 0.1C (0.2F) Accuracy: EC/TDS/SALT:E2%F.S; Temp: 1.0C Item size: 235 * 45 * 45mm / 9.25 * 1.77 * 1.77in Package size: 360 * 58 * 53mm / 14.17 * 2.28 * 2.17in Package weight: 218g / 7.69ounce Packing List: 1 * Water Tester 1 * Instruction Manual