Rugged construction designed for grow room environments

blot gently with soft tissue

accurate water testing solutions that meet the demands of professionals in hydroponics

3000 hours of continuous use (batteries included)

no refilling required

Bluelab pH 4.0 Calibration Solution – 250 ml / 8.4 fl oz water quality bench meter Rugged construction designed for growpH 4. 0 calibration solution a must in every grower's toolbox Contains 1 bottle 250 ml 8. 4 fl oz Boost your pH products longevity with regular cleaning and calibration Bluelab pH 4. 0 Calibration Solution ensures accurate pH meter readings with lab grade precision. This 250 ml bottle delivers consistent calibration for refractometers, pH meters, and water quality testing equipment. Essential for maintaining measurement accuracy in hydroponic systems,