For Fun and Intrigue:
This app is one actually tested and published by the Acoustical Society. (See Article Here)
Here is an example of one hearing aide Manufactures screening testing. Should only be used as a reference.
Printable reference poster.
Employee education from Colorado Speech and Hearing Association.
A great sound file demo from the UK.
Here are some simple YouTube videos we personally like:
Great how to document from Workplace BC
A detailed document for some light reading ;)
Provincial Guidelines (Manitoba)
How to use the posted N.R.R. on hearing protection and determine the de-rated value.