A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.
A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
A device used to measure amounts of time.
Any electronic function that causes a device to be able to do something automatically after a preset amount of time.
A person who records the time elapsed in a sporting event.
One who has done something a certain number of times.
One characterized by a certain time or time frame, such as their work hours.