Measuring 7 standard frequencies for both ears in less than 3 seconds, 3M E-A-Rfit Dual-Ear Validation System generates Personal Attenuation Rating to validate hearing protection and assist with hearing protector selection. System measures sound pressure levels objectively, both outside and inside hearing protection. Once measurement is complete, software displays PAR along with pass/fail indication for worker’s noise exposure level. Results are not affected by hearing level of employee.