The Extech PH220-C is a palm-sized pH meter with a cabled electrode that can measure pH, voltage potential difference (mV), and temperature. A built-in microprocessor provides for automatic buffer recognition, and the internal memory stores up to 25 readings. This completely waterproof unit features a large LCD display with simultaneous measurement readings and low battery indictor. Includes cabled pH electrode, protective holster, pH buffers, and 9V battery.