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BluelabBLU2210 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 p – H/0-50 C/32-122 F. Resolution: 0.1 p – H/1 C/1 F. Accuracy @ 25 degrees C: +/-0.1 p – H. Battery type: 1 x AAA alkaline. Loop handle for easy dipping and hanging.