Bluelab® pH 4.0 Calibration Solution (500 mL) Fungicide lawns and gardens

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Bluelab® pH 4.0 Calibration Solution (500 mL) Fungicide lawns and gardensBluelab pH 4. 0 Calibration Solution (500 mL) The Bluelab pH 4. 0 Calibration Solution is essential for use with all Bluelab pH products for the calibration of Bluelab pH Probes. pH instruments must be cleaned and calibrated at least monthly to provide you with the most accurate reading. pH measuring equipment is calibrated to pH 7. 0 first (buffer) then to pH 4. 0 (slope). To ensure solutions remain accurate: Avoid cross contamination Decanter into a