Chrono-meter is a device used to measure time precisely and accurately. It is often associated with marine navigation and aviation. The term chrono-meter is often used interchangeably with other words such as stopwatch, timer, chronograph, and horological instrument. A stopwatch is a handheld device used for measuring precise and accurate elapsed time interval. A timer, on the other hand, is used for measuring the duration of an event or activity. A chronograph is a device that combines the capabilities of a watch and stopwatch to measure time with more precision. A horological instrument is a general term used to describe any device designed for measuring time accurately.