Extech PH50

The Extech PH50 Waterproof pH Pen has a pH range of 2 pH to 12 pH with a LCD display that shows the pH readings. It makes it easy to calibrate a single CAL key with the automatic pH buffer recognition (4 pH, 7 pH, and 10 pH). The user has a choice of a 3 point calibration for better accuracy. This pen features the data hold which freezes the readings on the display as well as a low battery indicator. It also features an auto power off to help conserve the battery life. The PH50 comes complete with a built in electrode, sensor cap, inner pH electrode protection cap, and four LR44 button batteries.