Provides user with everything required to perform qualitative fit testing of disposable and reusable dust and mist respirators. Put hood on. Use the Sensitivity Solution in a nebulizer to check if your coworker can detect Bitrex. Once you've determined they can detect it, have them put on their respirator and use the Test Solution nebulizer. Go through the steps and if they can detect the Bitrex with their respirator on, it isn't properly fit and they should use a new respirator and repeat the test. If they can't detect the Bitrex, the respirator is a good fit.