Typically, a one-point calibration is made by placing the electrode in pH=7.00 buffer and adjusting the meter to read 7.00. The procedure below outlines a one-point calibration.
One-Point Calibration Procedure
Rinse the electrode with distilled water.
Place the electrode in a pH = 7.00 buffer solution.
Wait a moment for the meter to stabilize, then adjust the meter until it reads a pH of 7.00.
Remove the electrode from the solution and rinse it with distilled water.
Re-place the electrode in the pH = 7.00 buffer solution. If the reading does not return 7.00, then recalibrate the meter.