Voltcraft-CC-421-Calibrator-VOLTCRAFT-CC-421-P-The-Voltcraft-CC-421-current-calibrator-is-a-high-precision-calibration-tool-for-your-measurement-device-The-current-source-can-supply-up-to-24m A-max-at-400ohm-DC-current-measurement-up-to-24m ADC-&-loop-current-measurements-The-CC-421-connects-four-functions-in-one-device-Precise-DC-source-Measurement-of-process-currents-Supplying-&-measuring-2-conductor-loop-current-systems-&-Precise-DC-source-It-is-simple-to-use-with-only-3-slid