The Extech PH50 waterproof pH pen has a pH range of 2 to 12pH 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, 7, and 10pH). 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 and a low battery indicator. Product also features auto power off to help conserve the battery life.
The pH range is from 2 to 12-pH
LCD displays pH readings
Easy to calibrate single cal key with automatic pH buffer recognition (4, 7, and 10-pH)
Choice of 3-point calibration for better accuracy
Data hold freezes reading on display
Low battery indicator and auto power off
Complete with built-in electrode, sensor cap, inner pH electrode protection cap, and 4 LR44 button batteries