Fit testing as required by Australian New Zealand Standard AS/NZS1715 before a user wears a respirator in an at risk environment.
This OSHA based test involves assessing the donning and doffing of a respirator and challenging the seal on the wearers face to ensure the respirator gives its maximum design protection in the medical environment. This test is designed to challenge N95 and P2 respirator fits.  

3M QLFT (Taste) = QLFT: Aerosol Qualitative (Taste: Saccharin/Bitrex)