Tinnitus Talk Support Forum

Angieuurope
Can someone help me with this please. I would like to understand the protection of earplugs
kingsfan
There's no real way to tell without an actual test. I believe NIOSH provides software that is to be used with noise isolating headphones to test your ear plugs.

The EPA also has a little online test that you can use to test whether your earplugs provide a minimum of 15dBa protection.

Other than that, each country has their own derating formulas.