Bluelab pH 7.0 Calibration Solution
Bluelab pH 7.0 Calibration Solution - 250 ml is backordered and will ship as soon as it is back in stock.
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"pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope).
Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened."