American Marine 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 (approx. 25mL). All electronic pH instruments should be calibrated monthly. High, Mid or Low Range available.

Each sealed pouch contains approximately 25mL of fresh
calibration fluid. Very field portable, color-coded and dead-on accuracy.

Mid Range Calibration Fluid pH 7.00 (1 packet).