Fluke 773 Milliamp Process Clamp Meter Measure 4 to 20 mA signals without breaking the loop Source/simulate 4 to 20 mA signals and provide loop power Source/measure DC voltage to verify power supplies or I/O signals Best in class accuracy of 0.2% Delivers 0.01 mA resolution and sensitivity https://www.fluke.com/en/product/calibration-tools/ma-loop-calibrators/fluke-773