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Easy calibration The Poit PH meter is factory calibrated. Customers can use it directly. When the electrode exposed to air for extended period of time, users should calibrate it. This meter designed with auto calibration button. No need any adjustment screwdrivers, just press this button to finish the calibration. Specifications Measuring range: 0.00-14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH Batteries: 2x 1.5V LR44 button cells Automatic temperature compensation Dimensions: 6.06x1.26x0.79in Package Includes 1 x Poit PH meter 2 x 1.5V LR44 button cells(build-in) 3 x Pouch of pH Buffer Powders 1 x Carrying case 1 x User's manual