Fluke 789 Process MeterFluke 789 Process Meter Safety rated multimeters with mA source. Now process technicians can do a lot more while carrying a lot less. The ultimate loop calibration multimeter the Fluke 789 ProcessMeter. The Fluke 789 ProcessMeter was the first tool to combine a loop calibrator with a DMM to give process technicians double the power in one tool. The Fluke 789 has a display thats not only twice as large, but also twice as bright with two levels of