Bluelab pH 4.0 Calibration Solution- 250ml Trellis Net & Hangers This method:

This method:

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Bluelab pH 4.0 Calibration Solution- 250ml Trellis Net & Hangers This method:It is recommended that pH instruments are 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). Essential for use with all Bluelab pH products for the calibration of Bluelab pH Probes. To ensure solutions remain accurate: Avoid cross contamination Decanter into a smaller plastic cup Discard sample after use Store in a cool dark