This device was part of the inertial measurement unit for the Space Shuttle orbiter. It provided a stable platform for the Shuttle's guidance, navigation, and control, using a set of high-precision gyroscopes and accelerometers. It uses a system of four gimbals to maintain a fixed position in space regardless of any movements of the Orbiter. It is probably flown hardware. The device was transfered from NASA in 2014.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.