Hearos, Ear Plugs, Multi-Purpose Series, 2 Pair + Free Case

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  • Washable and Reusable
  • NRR 27
  • Trusted Since 1992
  • Plug In.

Tested according to ANSI Specs S3.19-1974

The level of noise entering a person's ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR.

Attenuation Chart (ANSI S3.19-1974)
Frequency 125 250 500 1000 2000 3150 4000 6300 8000
Mean Attenuation (dB) 39.4 35.4 38.4 39.3 37.4 40.6 37.7 40.7 42.9
Standard Deviation (dB) 4.5 5.2 5.1 4.3 4.6 4.6 4.6 4.5 5.3

Example:

  1. The environmental noise level as measured at the ear is 92 decibels dB(A).
  2. The NRR is 27 decibels (dB).
  3. The level of the noise entering the ear is approximately 65 dB(A).

Noise Reduction Rating 27 Decibels (When used as directed).

The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (Higher numbers denote greater effectiveness).

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