The Automated Filter Tester Model 8127 comes with a specially designed oil aerosol generator and advanced light scattering photometer that enables highly repeatable and reproducible filter efficiency measurements. The Model 8127 measures efficiencies up to 99.999 percent (penetrations as low as 0.001 percent). A variety of oils may be used. Operators are able to load and test over five filters per minute. This tester is most often used for quality control testing and the filter holder is often adapted to accommodate a wide range of respiratory masks and filter canisters. An external control interface for automated in-line testing is available.