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A field attenuation test was performed in 2007 by the Howard Leight Acoustical Laboratory onmore than 100 workers at eight different facilities during their standard work shifts. Locations and workers were not pre-screened, and workers were tested with their own earplugs they routinely wear on the job, with no modifications. The tested earplugs were from four different manufacturers. Workers received no training or coaching as part of the test, but were simply asked to insert the earplugs as they normally do on the job. No feedback or correction was offered if they fit the earplug incorrectly.
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