Bluelab pH 4.0 Calibration Solution – 250 ml / 8.4 fl oz aquarium iodine test place the CLEAR plastic cap

place the CLEAR plastic cap (supplied with probe) over the membrane

delivering consistent scale prevention and removal without the environmental impact

02 pH at 25°C

Battery Life: ~50 hydrogenation cycles (~7–10 days per charge)

compatible with the Milwaukee MI455 Total Acidity Mini Titrator and other wine testing equipment

Bluelab pH 4.0 Calibration Solution – 250 ml / 8.4 fl oz aquarium iodine test place the CLEAR plastic cappH 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,