Generally, chronographs are equipped with two function control buttons, located on the case middle: one for start/stop, the other for reset. Pressing the first one beyond the click starts the measurement of a given event: all the hands relating to the chronograph indications move until this same button is pressed again, stopping the hands. At this stage, it is possible to press it again (e.g. after a pause during a journey of which we want to know the net journey time), restarting the chronograph functions and automatically adding the time measured before the stop to the time to be measured after the restart. Alternatively, the totalised time can be reset to zero by pressing the other of the two push-buttons present: when pressed beyond the endurance click, it instantly returns all the hands of the chronograph indications to zero. The reset pusher cannot be operated during chronograph recording, but only after the functions have stopped, i.e. after the first of the two pushers has been pressed a second time (with the exception of the flyback function). A variant of the traditional chronograph is the mono-pusher, in which the start, stop and reset functions are handled by a single element and must necessarily be carried out in compulsory succession and it is impossible to stop the measurement. In this case, the pusher can be located at 2, 4 or inserted in the winding crown, in a coaxial position.
