Bluelab pH Calibration Solution is required for optimal performance of all Bluelab pH products; for precise readings, it is recommended to clean and calibrate you tester monthly. The acidity or alkalinity of a solution is represented by its Potential Hydrogen (pH) level. Values below 7.0pH indicate acidity, while values above 7.0pH mean alkalinity. Variations in pH can have an effect on the nutrient balance of the soil or solution. Conveniently packaged in 500ml bottles to be easily poured into smaller containers for use and to avoid cross contamination. Specifications: 2 x 500ml Bottles Ingredients: pH 4.0 - Potassium hydrogen phthalate, water pH 7.0 - Potassium di-hydrogen phosphate, di-sodium phosphate, water For use with Bluelab pH pen Features: Tamper evident lid Directions for use printed on label Package Includes: 500ml Bluelab pH4.0 Calibration Solution 500ml Bluelab pH7.0 Calibration Solution Please note: Please follow directions for use. Use within 3 months of opening.
