Specifications: Measuring range: 0-14 pH Resolution: 0.01 pH Accuracy: 0.01 pH Batteries: 4x 1.5V LR44 button cell (AG13) Automatic temperature compensation: 0-50°C (32-122°F) Dimensions: 15.2*2.9*1.5CM Weight: 50g Steps: 1: Turn on pH meter, Clean the electrode in distill water 2: Immerse the electrode in pH 6.86 standard buffer solution 3: Reset with screwdriver, until the display digital is 6.86pH. Then complete pH 6.86 calibration 4: Clean the electrode in distill water and dry it, immerse the electrode in Ph 4.00 standard buffer solution 5: Reset with screwdriver, until the display digital is 4.00pH. Then complete pH 4.00 calibration 6: Clean electrode and dry it, put the meter into PH 9.18 standard buffer solution. Check if reading is correct between 9.17-9.19pH Note: Please make sure liquid level is below 1.5 in when testing. Please do not put the electrode directly against any hard surface. Please only use liquid water for clean purpose, no soft paper, cloth or cotton. Recommendation When product is not used for 1 week or more, client should do the calibration opration for accurate reading. For initial use, make sure the meter is shut down, probe in distilled water 1-2 hours to active electrode, then do calibration operation. A pack of calibrated powder should be dissolved in 250ml distilled water, fluid can be sealed and stored in 10-20 ℃，avoid derect light for 3 months.
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