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 that shows the time; a timepiece.
A person (or something controlled by a person) that is or isn't punctual.
A person who keeps records of the hours of attendance of employees.
A person who records the time elapsed in a sporting event.