The term 'tumbler gear' refers to a mechanism comprising interconnected wheels inside a watch or clock that enable the balance staff to rotate back and forth at a constant rate. Other terms that can be used to describe this mechanism include escapement gear, balance wheel gear, and pallet fork gear. The tumbler gear is essential in regulating the speed of the watch, and without it, the timekeeping mechanism would be inaccurate. The movement of the gear train is what gives precision and accuracy to the timepiece, making the synchronization of gears crucial in timekeeping. With the right synchronization of gears, the watch can offer accurate measurement of second, minute and hour, and maintain precision over a long period of time.