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Calibration steps--YY-400
Aug 12, 2020
PH calibration: One point or two points or three points automatically. If the meter can't identify the solution, change the electrode, or contact us. PH Reset: 1. Shut-off meter, press HOLD/TEMP, and MODE/CAL simultaneously, don't release.

2. Press ON/OFF, and release all buttons reset is finished.

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