3M E A Rsoft 073 781 ~ 073 78 E A Rfit Microphone Assembly1 Cv 7100077867 Length_3 2 5 Inch The findings for the anti fog Application_Automotive Industry The findings for the anti fog performance of the eyewear are based on 3M internal testing per EN168 test method when compared to traditional anti fog coatings Commonly used in the Abatement market The complete system issues a pass or fail rating for each individual based on the employee's personal attenuation rating (PAR) The 3M E A Rfit Dual Ear Microphone Assembly works with the 3M E A Rfit Dual Ear Validation System to help employers determine whether workers are receiving adequate hearing protection from their hearing protector