User Manual Q&AAnswer
Feb 14, 2025 - 08:40 PM
To calibrate the Apera PH60S Premium Spear pH Pocket Tester Kit, follow these steps:
1. Short press the power button to turn on the tester.
2. Pour pH buffer solutions into the corresponding calibration vials, filling them to about half volume.
3. Rinse the probe in pure water and shake off excess water.
4. Dip the probe in the pH 7.00 buffer solution and make a quick stir in the solution, then hold still.
5. Long press the power button to enter calibration mode. The screen will turn green. (Short press the power button if you decide to quit calibration and return to measurement mode.)
6. Wait for the reading to stabilize on the screen, then short press the power button to start the 1st point calibration. After calibration is completed, the tester will return to measurement mode. An icon will appear at the bottom left of the screen, indicating a successful 1-point calibration (middle point).
7. To calibrate the 2nd point, use the 4.00 pH buffer and repeat steps 4.1.3 to 4.1.5. (Do NOT turn off the tester after you finish pH 7 calibration). An icon will display next to the middle point, indicating a successful 2-point calibration (low and middle points).
8. If necessary (target pH > 8.00), calibrate the 3rd point using the 10.01 standard pH buffer and repeat steps 4.1.3 to 4.1.5. An icon will show up next to the low and middle points, indicating a successful 3-point calibration (high, low, and middle points).
9. It is important to note that the 1st point calibration must be 7.00 pH. Perform the 2nd and 3rd point calibrations immediately after the 1st point calibration is finished. Do NOT turn off the meter before calibrating the 2nd or 3rd point. Otherwise, you will need to restart the calibration process with 7.00 pH first.
10. The pH 4.00 and 7.00 buffer solutions poured into the calibration vials can be used for up to 10 times as long as they are not contaminated and the bottles are capped when not in use. pH 10.01 can only be used for up to 5 times as it will lose its accuracy faster. After that, replace the buffer solutions in the calibration vials with new ones to maintain accuracy.
Please refer to the user manual for more detailed instructions and information on calibration.
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