Fluke 725/P27EX intrinsically safe. process calibrator and 300 PSI pressure moduleFluke 725 P27EX intrinsically safe. process calibrator and 300 PSI pressure module The 725EX I. S Multi function Process Calibrator is powerful yet easy to use. Combined with one of the (8) new Fluke 700PEx pressure modules, the 725EX is able to calibrate almost any process instrument likely to need service in an area where explosive gasses may be present. Measure and source mA, volts, temperature (RTDs and thermocouples), frequency, ohms, and