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Specification:Measure range: 0.00- 14.00PHResolution: 0.01PHAccuracy: 0.01 PHPower Supply: 2*1.5V (LR44 Button cell) (Included)Operating Temperature: 0°C - 60°CDimension: 155mm* 31mm * 18mmWeight: 50gCalibration tips:a. Dissolve PH buffer powder in 250ml of distilled water.b. Turn on PH meter and clean the electrode in distilled water, then immerse the electrode in the PH standard solution.c. Press " CAL" button, make the reading on display the same as the PH value of buffer powder and steady.d. Clean electrode with distilled water and dry it.Packaging:- 1×Digital PH Meter- 2×Calibration Packets- 1×Carrying Case- 1×User ManualReminder:- Pls make the connecting shrapnel of the battery case orient towards the side of LCD display, when you install battery case into the PH meter. To avoid battery case that are got stuck in PH tester.- Pls recalibrate the PH tester after open the battery case or replace the battery.- Pls clean the electrode with distilled water before or after use it.