4in1 water tester, pen type design, lightweight and portable, allowing you to 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. Designed with accurate electrode for precise measurement, with 0C-80C (32F-176F) wide measure ranges. Automatic temperature compensation, which ensures measurement accuracy at all temperatures, can perfectly possible errors due to changes in solution temperature, thus making the readings more accurate. Wide applications, suitable for domestic water, aquarium, aquaculture, catering food industry, fishery, swimming pool. Name: Water Tester Battery: 3 * 1.5V -13 button battery (included) : 0-19900us/cm 0-199.0 /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: : 1us/cm(Less than 1000us/cm) 10us/cm( 1000us/cm) 0.1ms/cm (SALT-785H) TDS: 1ppm(Less than 1000ppm) 10ppm( 1000ppm) 0.1ppt (SALT-785) SALT: 1ppm(Less than 1000ppm) 10ppm( 1000ppm) 0.1ppt S.G: 0.001 Temp: 0.1C (0.2F) Accuracy: /TDS/SALT:E2%F.S; Temp: 1.0C Item size: 235 x 45 x 45mm / 9.25 x 1.77 x 1.77in SALT-785H: Support testing SALT, , S.G. and temperature. Type: A: SALT-785H color:As shown :ABS Package Contents: 1 x Water Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.