Calibration
All pH probes drift and should therefore be calibrated prior to any series of readings. Fortunately, calibration is a simple process that uses standard pH buffer solutions. The user simply brackets the point he expects to measure by calibrating to buffer solutions above and below that point. For example, if expecting a reading of about pH 6, one would first calibrate the meter by placing the probe in a buffer of pH 7, and then pH 4. Many of our meters offer automatic buffer recognition, which recognizes and calibrates to the buffer solution with the push of a button.