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Hearing protector fit-testing, also known as field attenuation estimation system , determines how effective a hearing protection device is for an individual when worn correctly. This is typically carried out using one of the available fit-testing hardware and software systems. The effectiveness is typically measured as a personal attenuation rating which is subtracted from the known noise exposure to estimate the total noise exposure a single person has when wearing the tested hearing protection device. The Occupational Safety and Health Administration and the National Hearing Conservation Association Best Practice Bulletin: Hearing Protection Fit-Testing: Hearing Protection- Emerging Trends: Individual Fit Testing describes existing testing methods and how to incorporate them in hearing conservation programs.
Hearing protection devices such as earplugs or earmuffs must be worn correctly for the wearer to be protected from noise. Correct use of hearing protection includes:
Fit-testing hearing protection can facilitate an appropriate choice of hearing protection, and allow for the professional administering the fit-test to train users on proper techniques for wear.