Feature:
Measuring pH Range: 0.0 - 14.0 pH.
Resolution: 0.1 pH.
Accuracy: ±0.1 pH (20 degree)， ±0.2 pH.
Operating Temperature: 0 - 50 degree (32-122F).
Relative Humidity: <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:
 
1 x Digital PH Meter Tester Pen Aquarium
1 x screw driver