If the number of pharmaceutical houses using the test for their filters is any criterion, the answer is most certainly yes. it is also used by the FDA, and of course by many other facets of industry around the world. For example, every atomic energy commission in the free world uses DOP and the photometer for in-place filter testing, the U.S. navy has a special adaption of the basic test equipment for shipboard use and it would seem by its universal acceptance that any-one with a high-efficiency air filtration system needs one to insure the integrity of their system.