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How to Use: STEP 1: Turn open pH meter, Clean the electrode in distill water. STEP 2: Immerse the electrode in pH 6.86 standard buffer solution. STEP 3: Press the ""CAL"" button. Wait until the display digital is 6.86pH and steady. STEP 4: Clean the electrode in distill water and dry it, immerse the electrode in Ph 4.00 standard buffer solution. STEP 5: Press the ""CAL"" button. Wait until the display digital is 4.00pH. Then complete pH 4.00 calibration. STEP 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. Specifications: Measure range: 0.00-14.00 pH Resolution: 0.01 pH Accuracy: 0.01 pH Power supply: 2*1.5V (LR44 Button cell) Operating temperature: 0-50℃ Calibration: two points automatic calibration Dimensions: 150mm*25mm*13mm Net Weight: 52g/1.83 oz Package Includes: 1 x PH Meter 3 x Calibration packets 1 x Carrying case 1 x User's manual