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Quick view Pulse Instruments® ORP 2 point Calibration Kit with Quinhydrone The Pulse Instruments® ORP 2 point Calibration Kit with Quinhydrone provides a standard known value to calibrate and adjust instruments for higher accuracy and reliability. The kit includes 10g of Quinhydrone, 16 oz. of pH 4.01 and 7.01 calibration... MSRP: Now: $45.00 Add to Cart Compare Compare Selected