PINPOINT™ High-Precision Calibration Fluids: 4.000 +/- 0.002. These come in plastic envelope packets and are extremely accurate and field portable. Each packet contains ample fluid for calibration (about 30 ml). All electronic pH instruments should be calibrated frequently.

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Manufacturer:	American Marine
Availabilty:	Usually ships in 1-2 days
Price:	$1.09

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