PH Meter Digital PH Tester Pen for Water

Specifications: 2020 Updated Version Measuring Range: 0-14.0 PH Resolution: 0.1 pH Accuracy: ±0.1 pH (20°C) Use Environment: RH 95%, 0-50°C ( 32?176°F ) Battery: 2×1.5V LR button cell Weight: 1.76 OZ Package Includes: ? 1 x PH Meter ? 3 x Calibration packets ? 1 x Carrying case ? 1 x User's manual Water PH Tester Calibration: ? Turn on the pH meter ? Dissolve each buffer solution in 250 ml of distilled water ? Immerse the electrode into the pH 6.86 solution.(under the temperature of 25?) ? Press the “CAL”(calibration) button for 5 seconds and release - Display screen will start flashing “6.86” - Wait it until the display screen stops flashing. - Rinse the electrode with distilled water and make it dry. ? Repeat the above steps with 4.01 pH buffer powder and 9.18 pH buffer powder. Note: ?Clean the electrode with distilled water every time before and after use. ?Be careful with the glass probe since it may be a little fragile when you use. ?Remember to gently wipe it with a clean, soft cloth when you're done before capping it again. ?Open the battery case or replace battery, then need to re-calibrate the meter.