This pH checker/simulator developed by Sensorex® is a useful tool for troubleshooting or verifying the operational status of pH meters. A three-position push-button switch generates a millivolt output equal to pH 4, 7 and 10. A high impedance button simulates the impedance of a pH electrode. Quick disconnect interchangeable cables allow for use with a large variety of connector types (BNC, U.S. Std, Spade lugs, Radiometer, etc.). Uses standard 9V battery (not supplied) Specify connector type when ordering.