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2. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   Hearing protector fit-testing is a method that measures the degree of noise reduction obtained from an individual wearing a particular hearing protection device (HPD) - for example, a noise canceling earplug or earmuff. Fit testing is necessary due to the fact that noise attenuation varies across individuals.

3. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Various earmuff hearing protectors. Sound levels of some daily activities. A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss.

4. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   The OSHA training manual for inspectors says the adequacy of hearing protection for use in a hazardous noise environment should be derated to account for how workers typically wear protection relative to how manufacturers test the protector's attenuation in the laboratory. [41] For all types of hearing protection, OSHA's derating factor is 50%.

5. 3M agrees to pay $6 billion after US military said faulty ...

   www.aol.com/3m-agrees-pay-6-billion-122151751.html

   The earplugs were used by the US military in training and combat from 2003 to 2015. Veterans accused 3M of selling defective earplugs that caused hearing loss and tinnitus, according to a 2021 ...

6. Audiometer - Wikipedia

   en.wikipedia.org/wiki/Audiometer

   An audiometer is a machine used for evaluating hearing acuity. They usually consist of an embedded hardware unit connected to a pair of headphones and a test subject feedback button, sometimes controlled by a standard PC. Such systems can also be used with bone vibrators to test conductive hearing mechanisms.

7. Assistive Technology for Deaf and Hard of Hearing - Wikipedia

   en.wikipedia.org/wiki/Assistive_Technology_for...

   Hearing aids are electroacoustic devices which are designed to amplify sound for the wearer, usually with the aim of making speech more intelligible, and to correct impaired hearing as measured by audiometry. Some technologies also worth noting are cochlear implants and bone-anchored hearing aids (BAHA), which serve a similar purpose to hearing ...