Synchronizer
A very helpful tool of the editing room, a synchronzier is a device with a center axle and several sprocketed wheels attached to it. The wheels are called gangs. Film may be clamped into the gang, so that it can be measured with a footage counter on the front of the synchronizer. One revolution of the synchronizer equals one foot of film. Several elements, such as film and sound, A&B rolls, can be run in tandem can easily cut to the same length. It is used by the negative cutter for the assembly of A&B rolls, as well as for logging, measuring footage, syncing, and checking sync in the editing room.