Hayward ProChem pH Manual Del Propietário página 15

EN
6e. pH probe calibration
Always begin the calibration procedure with a calibration reset.
Note: If you have selected the "1 point cal.", the calibration will be made only in 1 point using the 7pH buff er solution.
Reference calibration
ProChem Single | pH · ORP Page 14 on 25
Only use spare parts supplied by Hayward brands ®