Operation: Remove protection; Turn on the PH55 by pressing the ON / OFF Button; Dip the electrode into the liquid to measure. The PH55 automatically compensates for temperature. To turn off the meter, press the ON / OFF / CAL button.
Calibration: Press the ON / OFF / CAL button until the OFF message is replaced by the CAL message. The meter is in calibration mode, and with the message "pH7.01 use", it asks to be immersed in pH7.01 calibration liquid. The meter will indicate "OK" and will ask to be immersed in liquid pH4.01. After being immersed in liquid pH4.01, after a few seconds, it will indicate "OK2" with which it is calibrated in 2 points.
For a single point calibration, immerse the meter tip in a calibration liquid (PH4, PH7 or PH10); Press the ON / OFF / CAL button until it goes into calibration mode; The meter will recognize the liquid and will be calibrated when you click OK. To exit calibration mode, press the Set / Hold button.
Electrode replacement: Unscrew the white ring, remove the electrode and replace it with a new one, taking care not to damage the connections.