What is real ear measurement?
Oh, if only getting a hearing aid was as easy as slipping it in your ear and stepping out of the audiologist’s office. Typically, there’s a few more steps involved: Your hearing care provider will want to confirm you understand how to use your new hearing aids, and that they’re properly calibrated and programmed for your needs. As part of the hearing aid fitting process, many hearing specialists and audiologists will also perform a real ear measurement (sometimes also referred to as “real ear verification”).
Source: Healthy Hearing