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). It has become a favorite in such applications as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.