Vintage Madsen Immittance Audiometer ZO174

Description

I could find very little info about this and what I could find was from the late 80’s, early 90’s. It came from a hospital setting with no indication of functionality. I do believe it works, but I’m not sure what accessories might be needed.
This listing is for the unit only. No power cord or any other accessories.
"The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, do not bid on this item unless you are an authorized purchaser. If the item is subject to FDA regulation, I will verify your status as an authorized purchaser of this item before shipping of the item."