Feature:
??? ** Measuring pH Range: 0.0 - 14.0 pH.
??? ** Resolution: 0.1 pH.
??? ** Accuracy: ±0.1 pH (20°C)， ±0.2 pH.
??? ** Operating Temperature: 0 - 50°C (32-122°F).
??? ** Relative Humidity: !#!lt!*!95%.
??? ** Life: approx.700hours of use.
??? ** Calibration: manual，1 point.(not included)
??? ** Power: 3 x 1.5V(AG-13 button battery)(included).
??? ** Size: 15.2cm x 2.8cm x 1.5cm.

Package Included:
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1 x Digital PH Meter Tester Pen Aquarium
1 x screw driver