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May 22 - Jun 15
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PH Meter + Free 2 pack calibration powder Main technical indicators: Measurement range: 0.00-14.00PH Accuracy: + 0.2PH + 0.1PH (20 C) Resolution: 0.1PH Working temperature: 0 C ~ 50 C Battery: 3X1.5V (AG13 button battery) Outline size: 142mm (L) x 29mm (W) * 15mm (H) Weight: 51 grams Calibration of pH meter: 1. Rinse the calibration powder with 250ml distilled water or pure water. Dip the pH electrode into a standard buffer solution of mixed phosphate with pH 6.86 (or 4.0) and shake it gently. 2. The calibration potentiometer can be adjusted by turning the small yellow screwdriver to the round hole behind the pH pen, until the display value is consistent with the standard buffer solution's pH value of 6.9 (or 4.0) at ambient temperature. Drugs should not be dirty, sealed with fresh-keeping film after calibration, can be reused, washed with pure water after calibration, if not frequently used, can be calibrated once in March-June! How to maintain pH pen: If you don't use it for a long time, you can immerse the electrodes of the pH pen in pure water in about half a month, and insert them into a disposable cup.

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