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Specifications: Measure range: 0.00- 14.00PH Resolution: 0.01PH Accuracy: ±0.01 PH Power Supply: 2*1.5V (LR44 Button cell) (Included) Operating Temperature: 0°F - 140°F Dimension: 155mm* 31mm * 18mm / 6.10”×1.22”×0.70” Weight: 50g / 1.76oz Features: Automatic Temperature Compensation (ATC) One button (CAL) calibrate the PH meter Automatic shut-off after 5minutes with inactive Calibration: 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 equal to standard buffer solution PH 6.86 or 4.00 or 9.18 (whichever available ) d. Clean electrode with distilled water and dry it. PACKAGE INCLUDES: 1×PH meter 2×PH buffer powder 1×Carry Case