watch tachymeter

[Ylen13]

i have seiko watch and it has tachymeter, what is it for?

 

[KingNothing]

Monitoring your heart rate I think.

 

[notfred]

It tells you how tacky your outfit is.

 

[boyRacer]

it measures distances and elevation

EDIT:

Tachymeter: Measures the speed of a particular distance the wearer travels. A tachymeter is one feature of a chronograph.