After you perform any maintenance or troubleshooting on a hearing aid, performing a listening check allows you to assess your handiwork. You might have access to a listening scope, which is essentially a tube or pair of tubes (one for each ear) that ends in a rubber sleeve. The listening scope permits you to listen to the hearing aid by pressing the sound bore of the earmold (or dome) into the listening scope sleeve. Talk into the hearing aid, or point it around the room. Do you hear amplified sound? Do you hear excessive static, beeping or other sounds that seem to indicate the hearing aid is not working? While you cannot tell whether the aid is putting out the appropriate sound level just by performing a listening check, you can at least make sure the hearing aid is on, and free from unwanted noises. You should do a listening check after every time you work on a hearing aid.