AimoTek AMPX01 Multifunction Process Calibrator DCV/mA Source and DMM Multimeter 2in1 USB 1uA Resolution Measure loop current signals with very high accuracy of 0.02% and 1uA resolution Source voltage from 10uV to 10V Measure voltage output process signals from PLCs, transmitters 24V loop supply USB Interface: Windows OS (only Multimeter Function)