The rugged PFM Tester Series by Flo-tech now features an internal safety pressure relief disc, or “burst disc.” The PFM series has long been relied upon to measure flow, pressure, temperature and horsepower on mobile hydraulic equipment. Effective immediately, all PFM Testers will include an internal burst disc component. The new design ensures that in the event of an over pressurization, that the fluid is safely allowed to bypass the load valve and remain within the hydraulic system. No fluids will escape outside of the tester. Maintenance costs are thereby reduced, and potential harm to the environment from spills is eliminated with the internal design. As before, the internal burst disc is field-replaceable, should an over pressurization occur.