Hanna Instruments HI98103 Checker pH Tester with Ph Electrode and Batteries, 0.00 to 14.00 pH, +/-0.2 pH Accuracy, 0.1 pH Resolution

Compact pH tester with narrow probe for use in small samples or test tubes
Manual two-point calibration through trimmers for custom calibration
Single-line LCD display screen for ease of viewing
Replaceable electrode with screw connector to extend meter life
Low power demand for extended battery life