recommended. Calibrate with standards that bracket your intended measuring range while including a neutral standard (pH 7.00 or 6.86). For example, if you expect to measure samples from pH 6.2 to pH 9.5, calibration with 4.01, 7.00, and 10.01 will work well. The 700 series meters can be calibrated with up to 5 buffers. The non-volatile memory retains all calibration values upon meter shut down.
The following calibration standards are automatically recognized;