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Pinpoint pH Calibration Fluid Kit - pH 4.0, 7.0, 10.0 - American Marine
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PINPOINT® High-Precision pH Calibration Fluids come in plastic envelope packets and are extremely accurate and field portable. Each packet contains ample fluid for calibration (about 30 ml). There is a free sample of these included with each PINPOINT® pH Monitor and PINPOINT® pH Controller.
All electronic pH instruments should be calibrated monthly.