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Atlas Scientific ORP/REDOX Calibration Solution The Atlas Scientific solutions are manufactured under strict conditions to insure quality and stability, which are standardized against NIST-certified references.Each bottle is packaged in an additional plastic bag to ensure against leakage or damage. Features: Manufactured under strict conditions to insure quality and stability. ORP/REDOX calibration test solution material is not expected to be harmful to the ecology. This calibrator solution, is not a dangerous substance per GHS classification criteria. Good for 30 days after opening Careful evaluation of these reveals they are not calibration solutions, they are described as perfect checking solutions. Also these solutions typically have very wide tolerances, ±35 mV or more, for the actual values one can expect when checking their ORP. This ORP Test Solution is used to calibrate & confirm that a ORP probe is working properly. ORP (Oxidation-Reduction Potential) is the measurement, in millivolts, of a solution's capacity for electron transfer (oxidation or reduction). ORP measurement may also be called REDOX for Reduction Oxidation.