The pH Checker supplies users with fast and accurate readings from 0 to 14 pH with a resolution of 0.01 ph. This compact tester has an easy to read LCD display and simple to perform two point calibrations. The pH electrode of the Checker can be easily replaced. You only need to unscrew the electrode from the meter body and screw on a new one. The Checker is fast, accurate, lightweight and with 3000 hours of battery life, you won't have to worry about frequent battery replacement.