The Triplett PCAL300 Loop Process Calibrator is a device for benchtop and field industrial process device testing and calibration. This unit can easily measure DC voltage/current and source DC mA current with an accuracy of 0.02%. The PCAL300 can simultaneously provide 24V loop power to the transmitter while conducting mA current measurement. In addition, this unit features an adjustable 0-20mA/4-20mA span with % readout, automatic sawtooth or triangular output current step function, auto power off, and a built-in flashlight.