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Ear Plugs, NRR 32 10 pair + case. Innovative bell shape. The future is hear. Tested according to ANSI Specs S3.19-1974. The level of noise entering a person's ears, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: 1. The environmental noise level as measured at the ear is 92 decibels dB(A). 2. The NRR is 32 decibels (dB). 3. The level of the noise entering the ear is approximately 60 dB(A). Attenuation Chart (ANSI S3.19-1974): Frequency: 125; Mean Attenuation (dB): 35.0; Standard Deviation (dB): 4.7. Frequency: 250; Mean Attenuation (dB): 34.7; Standard Deviation (dB): 3.9. Frequency: 500; Mean Attenuation (dB): 39.3; Standard Deviation (dB): 4.3. Frequency: 1000; Mean Attenuation (dB): 40.2; Standard Deviation (dB): 3.7. Frequency: 2000; Mean Attenuation (dB): 40.3; Standard Deviation (dB): 3.1. Frequency: 3150; Mean Attenuation (dB): 44.6; Standard Deviation (dB): 3.8. Frequency: 4000; Mean Attenuation (dB): 45.6; Standard Deviation (dB): 4.1. Frequency: 6300; Mean Attenuation (dB): 47.5; Standard Deviation (dB): 4.5. Frequency: 8000; Mean Attenuation (dB): 48.6; Standard Deviation (dB): 4.6. Noise Reduction Rating: 32 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). Federal law prohibits removal of this label prior to purchase. EPA. Label required by US EPA regulation 40 CFR part 211, subpart B. USA made. Made in the USA.
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Cheapest price in the interval: 4.99 on March 31, 2022
Most expensive price in the interval: 5.99 on June 6, 2022
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