Sper Scientific 860031 pH - mV Bench-Top Meter - Manual (Page 29)

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PH PROBE CALIBRATION
Calibration is necessary before measurement. For the
highest accuracy, we recommend a two point calibration. If
only calibrating at a single point, make certain that the
buffer value is close to that of the sample being measured
and that the buffer temperature remains stable.
1. Press POWER to turn the meter on and press MODE
continuously to select pH.
2. Rinse the probe in de-ionized water or rinse solution.
Shake and air dry but DO NOT wipe the pH probe dry.
Wiping the probe may cause static and cause calibration
and measurement instability.
3. Select the pH buffer and pour solution (a sufficient
amount to totally immerse the probe tip) into a clean
container.
4. Dip the probe into the container, immersing the probe
tip.
5. Stir the probe gently to create a uniform sample.
6. Press CAL to enter calibration mode. “CAL” will flash on
the lower left of the LCD.
Note…
The main display indicates the measured value, and the
secondary display value indicates the desired value
according to the buffer type selected (NIST or CUSTOM).
Refer to CALIBRATION BUFFER page 20.