Waterproof pocket ORP tester with relative and absolute mV measurement modes, suitable for measuring oxidation-reduction potential of liquids, accuracy 2 mV.

Waterproof pocket ORP tester, 1 point calibration, BNC connector enables easy connection to various ORP electrodes, accuracy 2 mV.

Wireless Bluetooth ORP tester for Android smartphone or tablet, 1 point calibration, setup menu contains 10 options, accuracy 0.2 mV.

Professional portable ORP meter, 1 point calibration, setup menu contains 10 options, accuracy 0.2 mV.