The Integritest® line of automated integrity testing instruments uses pressure decay measurements to determine the integrity of a filter. Along with a system volume measurement, one pressure decay measurement is taken to determine the relevant flowrate for diffusion and HydroCorr™ tests. The Tangent Method is used to determine a filter bubble point from a series of pressure decays performed at increasing transmembrane pressures. The Integritest® 5 improves on test speed by optimizing the algorithm. This instrument identifies optimum pressures at which to take measurements based on test parameters and ongoing readings, which reduces the number of measurements needed to reliably map the filters’ profile and return an accurate result.