Wrist teathers like this one used with the IMAX camera are a safe way to ensure objects do not float away from astronauts or the spacecraft during extended periods of use. The two-part closure mechanism does not permit for accidental release of the latch.
NASA transferred this tether to the Museum with two others and other IMAX camera equipment in 2012.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.