These ampules provide a fast, safe and easy method to perform a respirator fit check.When activated, ampules give off a non-irritating odor of banana oil (Iso Amyl Acetate). If banana odor is detected by wearer, respirator should be adjusted or replaced. Designed for interim testing with fully fit-tested respirators. Box of 10 ampules. NOTE: This test method alone does NOT meet NIOSH respirator fit testing requirements. Use only in conjunction with a NIOSH-approved fit test method. Allegro brand.