Ulysse Girard Marlin – Mens Stainless Steel Tachymeter Sport Watch Water Resistant to 330 Ft. – Colored Analog Dial, Quartz Movement – Tachymeter
How to use the Tachymeter
The most common use of a tachymeter is for measuring the approximate speed of a vehicle over a known distance.
(e.g.) Based on how many seconds it takes a vehicle to travel 1km or 1 mile (the available measuring range is up to 60 seconds), the average speed within the distance can be calculated.
Note: The tachymeter indications may appear on dial ring, rather than on the outer bezel (depending on model).
As shown in the illustration, it takes the vehicle 45 seconds to travel 1km so the approximate average speed is 80kph (50 mph).
Chrome Plated Stainless Steel, 18 millimeters
100m / 330ft
Japanese Quartz – Miyota 2315 Movement
Standard 377 (SR626SW) battery
Hours, minutes, central chronograph seconds, date