ORP Redox Meter -1999~1999mV Oxidation Reduction Potential Tester with 256mV ORP Calibration Buffer for Water Testing, Aquarium, Research Laboratory (ORP-228 Meter+Calibration Powder) ORP-228 Meter+Calibration Powder auspowers_batchsix helping your computer create a

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ORP Redox Meter -1999~1999mV Oxidation Reduction Potential Tester with 256mV ORP Calibration Buffer for Water Testing, Aquarium, Research Laboratory (ORP-228 Meter+Calibration Powder) ORP-228 Meter+Calibration Powder auspowers_batchsix helping your computer create aORP Redox Meter 1999~1999mV Oxidation Reduction Potential Tester with 256mV ORP Calibration Buffer for Water Testing, Aquarium, Research Laboratory (ORP 228 Meter+Calibration Powder) Product Features Inexpensive and practical device with 1 point calibration, easy to use and highly accurate Scale of measurement: 1999 ~ 1999 mV in 1 mV steps Find out quickly the sort of water you drink and how your filter works efficiently and effectively. Determine the