3M Bitter Fit Test Solution 3M Bitter Fit Test Solution Test kits and accessories designed to help your organization meet OSHA fit testing requirements for respirators. The products can be used to check face-to-respirator seal on any particulate respirator or gas/vapor respirator with a particulate prefilter. Features: Bitter taste fit test solution for fit testing Used with the 3M Qualitative Fit Test Apparatus FT-30 Can be used to check face-to-respirator seal on any particulate respirator or gas/vapor respirator with a particulate prefilter. One count