How to Put in Foam Earplugs and Test Their Fit for Optimal Noise Reduction
Learning how to put in earplugs isn’t rocket science, or is it? Sadly, in multiple studies, fitted earplugs did not even provide half the noise reduction that was printed on the package. The striking difference between the noise reduction rating (NRR) obtained in the lab and real-world noise reduction prompted the National Institute for Occupational …
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