A:
A two point calibration with a buffer of 7 plus 4 or 10 is recommended. A one point calibration is also valid. For best accuracy, always calibrate at the sample temperature.
1. Place electrode into buffer solution (4, 7, or 10) and momentarily press the CAL key. pH 7 should be calibrated first, then 4 and/or 10 pH.
2. The unit automatically recognizes the solution and calibrates itself to that value.
3. During calibration, the pH reading flashes on the main display.
4. When calibration is complete, the unit automatically displays ‘END’ and returns to normal operation mode.
5. The calibration data is stored until a new calibration is
performed.
6. For a two or three point calibration, repeat steps 1-4.
Answered on 4/12/2010 by Aaron from Tech Support