A twist timer is a device that is used to time the duration of an event. It consists of a winding mechanism and a release mechanism. The winding mechanism is used to wind up the spring inside the timer. The release mechanism is used to release the spring and allow it to unwind.
The amount of time that the timer will run for is determined by the amount of time that the spring is wound up for. The more the spring is wound up, the longer the timer will run for. Once the spring is wound up, the timer can be started by pressing the release button. The timer will then run for the amount of time that the spring is wound up for.
Twist timers are commonly used to time events such as cooking food, boiling water, timing the duration of a presentation, or timing the duration of an exam.