Specification: Material: ABS. Battery: 3 x 1.5V AG-13 button batteries (not included) Temperature Compensation: Automatic Temperature Compensation (0-60 Auto power off: 5minutes Environment temperature: 0-60℃(32-140℉)RH 100% Size: 183*37mm/7.2*1.5 inches (approx.) Specification pH TDS Temperature Range 0.00-14.00PH. 1-1999μS/cm 0-60°C Resolution 0.01 ph. 1PPM / Accuracy +-0.05ph +-2% +0.5°C Calibration 6.86 points: Accuracy +-0.05 pH 6.86/4.00(6068/9.18) points: Accuracy +-0.02pH Factory calibrated (1413 s/cm) / Package list: 1 x water meter (battery not included). Features Wide Application - Suitable for water sources, aquariums, hydroponics, spas, swimming pools and other water systems. Strong Function - 3 in 1 multifunctional water tester, test the pH, TDS and temperature of all liquids. Automatic temperature compensation (0℃~60℃). HIGH PRECISION -- Highly efficient and accurate with advanced microprocessor technology. Large LCD screen -- Large LCD display, easy to read the value displayed. Easy to Carry - Lightweight and portable design, convenient for indoor and outdoor use.