With this new Fluke 771 mA compact clamp meter for PLC and control systems analog I/O, one can measure 4- 20 mA signals without breaking the loop, a Fluke statement noted. The detachable clamp with extension cable allows users to take measurements in tight locations, and the built-in spot light illuminates hard to see wires in dark enclosures. The 771 can be used to measure mA signal for PLC and control system analog I/O; measure 4 to 20 mA output signals from transmitters without breaking the loop; count on best-in-class accuracy of 0.2 per cent; measure mA signals with 0.01 mA resolution.