"pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened."
Alexander Thomas - 2024-03-03
Superb product quality and the shipping was faster than I could have hoped for. The customer service team is very supportive.