Glossary

Is a gauge that measures the speed of a moving object over a specific distance. It is usually found on the edge of the bezel or the outer rim of the watch dial. It is used to measure speed based on elapsed time. The tachymeter scale is typically marked with units of speed such as kilometers per hour (km/h) or miles per hour (mph).

The timing function starts working like a chronograph and measures the time it takes to travel a certain distance. Then, you can read the speed of the moving object on the tachymeter scale based on the elapsed time. The tachymeter scale is commonly used in sports such as car racing and other activities that rely on speed.