American Marine 400 ORP REDOX Calibration Solution
American Marine ORP/REDOX calibration fluid. With a precise measurement of 400mV this calibration fluid is included with every PINPOINT ORP Monitor and PINPOINT ORP Controller. Occasional retesting with this fluid will keep your readings dead-on accurate. Also very useful to determine if an ORP/REDOX probe is ready for replacement.
Includes: 1 packet