... Electrode, ORP Electrode (Only for BANTE 221), pH Standard Buffer, Temperature Probe AUTOMATIC CALIBRATION:The meters is capable of calibrating ... up to 3 points using USA or NIST pH standard buffer. From Setup Menu, choose Calibration and immerse pH electrode ... , press ENTER key and meter is automatically calibrated.AUTO-BUFFER RECOGNITION:During calibration, if the calibration solution does not ...