American Marine Pinpoint PH Fluid 7.0

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PINPOINT" High-Precision pH Calibration Fluids 4.000 +/- 0.002 7.000 +/- 0.002 10.000 +/- 0.005 These come in single-use plastic envelope packets, and they are extremely accurate a nd field portable. Each packet contains enough fluid for a complete calibration (about 30 ml) and is intended to be discarded after use. Show more