Bluelab pH Pen

Measures pH and temperature. Selectable units for ?C & ?F. Backlit LCD display. Double junction probe (not replaceable). Successful calibration indicator. Hold reading function and low battery warning. Fully waterproof with auto off function. Automatic temperature compensation. Range: 0.0 - 14.0 pH/0-50?C/32?-122?F. Resolution: 0.1 pH/1?C/1?F. Accuracy @ 25?C: ?0.1 pH. Battery type: 1 x AAA alkaline.