Features： 1、Accurate and Reliable: Water quality detector is equipped with titanium alloy probe for high accuracy, and reliable automatic temperature compensation (ATC) ensures accurate readings at various temperatures. 2、Simple and Fast: Just turn on pH meter and stir the water gently, then a stable reading will be displayed on LCD within a few seconds, if there is no operation for more than 5 min, TDS PPM meter will auto turn off. 3、Data Hold Function And Auto Shutdown Function: 4 in 1 water quality tester can freeze measurements for viewing in water. Turn off the meter after 5 minutes of non use to save battery. 4、Wide Use: Pocket sized TDS pH meter is the ideal test kit for home and laboratory use. Ideal for testing water, swimming pools, aquariums, spas, hydroponics, food, wine and brewing, and more. 5、4 in 1 Design: Water quality test pen measures PH, TDS, EC, TEMP. High sensitivity probe, high sensitivity and quick response, small size, lightweight, easy to carry and simple to operate. Specification： Item Type: Water Quality Tester Material: ABS Weight: Approx. 180g / 6.3oz Battery: 4 x LR44 Button Batteries (not included) Uses: Suitable for testing water, swimming pools, aquariums, spas, hydroponics, food, wine and brewing, etc. TDS: Range: 0-9999ppm Resolution: 1ppm Accuracy: ±2% EC: Range: 0-9999μs/cm Resolution: 1μs/cm Accuracy: ±2% pH: Range: 0.00-14.00ph Resolution: 0.01ph Accuracy: ±0.05ph Temperature Range: 0-60 DegreeC / 32-140 DegreeF Package List： 1 x Water Quality Tester (Battery Not Included) 3 x Detection Powder 1 x Manual