Check the listing for details. HM Digital PH Meter PH-80 Handheld Water Resistant Water Quality Tester. Condition: New. Listed at 39.99 USD. PH-80: pH HydroTester Series The PH-80 has proven to be the MOST reliable pH meter in its price range. It has become a favorite in such applications as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more. FEATURES: Measures pH and Temperature One-touch automatic digital calibration Water resistant Simultaneous temperature display Large LCD display Automatic Temperature Compensation (ATC) Auto-off function, data-hold function and low-battery indicator Factory Calibrated: The PH-80 meter is factory calibration to pH 7.0. Includes a translucent cap, batteries, storage solution and pH 7.0 buffer (powder) PRODUCT DESCRIPTION pH Range: 0 – 14 Temperature Range: 1-55 °C; 32-130 °F Resolution: 0.1 pH; Temperature resolution is 0.1 °C/F Accuracy: +/- 0.2 pH; Temperature accuracy is +/-2% Calibration: Digital automatic calibration (one point) Minimum EC/TDS: 10 µS/5 ppm Electrode: Glass sensor and reference tube electrodes Power source: 3 x 1.5V button cell batteries (model LR44 or equivalent; included) Dimensions: 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches) Weight: 53.9 g (1.9 oz)