This timer is a non flight example of equipment flown Apollo missions. It is a mechanical timer that can be operated in two modes (6 minutes and 60 minutes). The timer works like a standard kitchen timer, sounding a bell when the selected interval is over.
The timer was transferred from NASA to the Smithsonian along with the contents of Command Module "Columbia" in 1971.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.