What about IREM?
In the article link below it says the Sharkey Zon has IREM (Integrated Real Ear Measurement). Here is a short paragraph from the link at the bottom of the post.
Easy Fit for the Easy Life
A fitting doesn’t take long. And that period of adjustment (yes, there is one) is shortened through the use of Starkey’s Integrated Real Ear Measurement (IREM) which enables the fastest fitting west of the Pecos. East, too probably.
When Starkey introduced IREM, audiologists held parades. (Okay, they didn’t) But there was a lot of excitement. Ear pros glowed over reported improved fitting accuracy and, FYI, Zon is the only model in its class to offer IREM fitting. So what is IREM fitting? It is the ability of the hearing aid professional to run a test while the hearing aid is sitting in your ear. It provides an accurate “real ear” picture of what is occurring to the amplified sound once it has entered your ear canal. The benefit of this to the professional is a more accurate fit. The benefit to the hearing aid wearer is more natural sound and definitely more smiles.
Here is what we want in a hearing aid:
Easy fitting and adjustments
Wearing comfort for 18 hours a day
Hearing that is organic and natural
Discretion or flash – it’s our choice
Automated feedback suppression
Control over background noise
Automated, “Thinking machine” adjustments
Durability and reliability even under harsh conditions – did I mention Zon is 100% waterproof?
http://www.healthyhearing.com/hearing_library/article_content.asp?article_id=836