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pH 4.0 Calibration Solution - 20 ml

The 20 ml satchet of Bluelab pH 4.0 Calibration Solution is reference marker for pH instruments to maintain consistently accurate readings regarding the conductivity and balance of the aquarium water quality. Instruments that measure pH need constant recalibration to ensure consistency, and this solution will help ensure that the EC/CF probe is clean and in proper working order.

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