The VeriFit Irritant Smoke Generator's patented design integrates all traditional irritant smoke test components into one convenient device. Irritant smoke is the only OSHA-accepted qualitative fit testing method that does not rely on the test subject's subjective response. Other types of qualitative fit tests, such as banana oil, saccharin, or Bitrex, may cause false negative results. Unlike other test methods, there is no need for nebulizers, pumps, mixing jars, batteries, test masks, probes or hoods. Each tube is a complete, safe, ready-to-use, OSHA-compliant fit testing kit.You can perform 5 - 7 fit tests with each tube.