50ML PH Meter Standard Solution Calibration 4.00/7.00/10.01/222mV ORP Tester

ORP: 222mV. Each bottle has a capacity of 50ML. It has a concentration of 12.88 ms/cm and1413μs/CM. Capacity: 50ML. PH specification: 4.00/ 7.00/ 10.01.

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