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4.00 pH Calibration Fluid

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This fluid is required if you want to monitor low pH values, such as in a calcium reactor. Do not use this fluid if you intend to use the electrode for aquarium water, for which you will need a set of 7.00 and 10.00 pH fluids. Monitoring your calcium reactor? Use this 4.00 pH calibration fluid!

Product number: CAL4

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