The Fluke 789 ProcessMeter is a powerful, combined tool for industrial professionals, merging a full-featured mA loop calibrator (source/simulate 4-20mA, 24V loop power, HART resistor) with a high-accuracy digital multimeter (DMM), featuring a large dual display for simultaneous readings, enhanced backlight, and robust safety ratings (CAT III 1000V/CAT IV 600V) for troubleshooting and calibrating process control loops efficiently, eliminating the need for separate power supplies or resistors