Hanna pH Meter pH Tester by Hanna Instruments. 0 to 14 pH range. + or – .2 pH accuracy. .01 pH Resolution. Hanna Instruments HI98103 Checker pH Tester with pH Electrode and Batteries, 0.00 to 14.00 pH, +/-0.2 pH Accuracy, 0.01 pH Resolution Related: All Grain Tips & Gear More: Recent Amazon Finds Going on Now: Amazon Prime Day!