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What is the Noise Reduction Rating (NRR) on an earplug or earmuff?

April 26, 2017earmuff earplug noise nrr rating reduction

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What is the Noise Reduction Rating (NRR) on an earplug or earmuff?

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The Noise Reduction Rating or NRR measures the muff or plug’s ability to block out noise or “attenuate” sound. This measurement is stated in decibels, so a plug with a NRR of 26 blocks out a maximum of 26 decibels of noise. The NRR listed is the maximum protection that could be achieved if the plug fit the wearer perfect and was inserted correctly.