Tip & How-To about Watches
Many of watch brands has outer bezel ring calibrated as TACHYMETER/ TACHOMETER. In simple words this is SPEEDOMETER on your wrist, like in your car. The only difference is: it does not work automatic, but you have to have some maths basics in your brain to make work it.
The main thing is: As second is taken as measuring point (any wristwatch is moving sec by sec, min by min, hr by hr and so on), there is no actual possibility to measure speeds less than 60 km/h. This is because our time is divided to hours, minutes and seconds (1 hr=60 mins= 3600 secs), but ordinary watch on your wrist can't count smaller than a second, so, the starting point still is 60 for the majority.
The best watch tachymeters are producing/manufacturing BREITLING, as they have very long relationship with aviators all over the world. Braitling watches can count up to 1/10 of second.
OK, here is the link to learn basics of how to use tachymeter:
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