Model 875 has measurement probe with automatic calibration technology that maintains accuracy and speed even as distance between noncontacting probe and monitored surface changes. It include measurement range of ±500 Vdc or peak ac, accuracy of ±0.5%, speed of 25 ms, and low noise of 2.5% FS. Buffered output voltage and current monitors are provided for remote monitoring and alarm purposes. Unit is powered by +24 Vdc and enclosure mounts on 35 mm DIN rail.