USAF Altitude Teaching Tool

Description

Not real positive on the origin of this one or its purpose, perhaps some of you know far better than I. It was purchased in a collection from a military surplus that sold out, I was told then it was an altitude tester. The altitude measure still seems to work well. Please note there is a broken cover to the EGT gauge.
Please shoot me any questions and be sure to check out my other militaria listings. Thanks for looking!