These calibration solutions allow you to recalibrate a pH meter that is giving improper readings. In order to properly calibrate a pH meter, you must have a test solution with a known pH level. These solutions will have you calibrate your meter until it gives a reading of 4 or 7 that matches the bottle.

Optimum Hydroponix pH 7 Calibration Solution 500ml

SKU: WE-OPTPH/#7
C$9.99Price