Hearing protector fit testing (HPFT) is a critical advancement in workplace hearing conservation and is recognized as a best practice (OSHA et al., 2008; OSHA, 2017). HPFT is not required under OSHA’s Occupational Noise Exposure standards (29 CFR 1910.95; 29 CFR 1926.52), but can be a valuable training tool for workers. HPFT measures the amount...