The Model C110 Checker/Simulator verifies pH and also incorporates +/- 700 mV outputs to verify ORP/REDOX instruments. This is an ideal unit for full pH and ORP/REDOX field troubleshooting. The compact case uses a water-resistant rubber key pad that feels nice to the touch. Impedance loaded or no load signals may be generated with this unit. Included with the checker is a CX2 interconnect cable with BNC connector. The C110 pH/mV checker simulator is a millivolt source that can be used to calibrate or check the calibration of a pH or ORP (mV) meter. It also serves as a troubleshooting toll when pH or ORP systems fail. For troubleshooting, the electrode is removed and the simulator is connected in its place. The C110 sends a signal to the meter to verify the performance of the meter. Signals of pH4, pH7 and pH10 are available, as well as +/-700mV for ORP. A properly working meter (by process of elimination) indicates that the electrode may be the cause of the failure. It is supplied with a 9V battery which comes installed in the unit.