Tip & How-To about Watches

TACHYMETER/TACHOMETER - how to use it.

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:
http://www.mydigitallife.info/2006/12/10/how-to-use-tachymeter-function-on-watch-bezel-usage-instruction-and-definition/

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2 Answers

how do I use the moveable outer numbered ring on the t49825dh?


The numbered bezel can be used by divers to measure elapsed time on their oxygen supply. Place the zero where the minute hand is now and you'll know when 20 or 30 minutes have passed when the minute hand reaches bezel number 20 or 30.

In the same way, you can use the bezel to tell when 30 minutes have passed on your parking meter if you simply put the 0 on the minute hand when you leave the car. When the minute hand reaches the 30 mark, a half hour will have passed.

Typically, the bezel only turns counterclockwise to keep the wearer from bumping and changing the elapsed time number. On some less expensive watches, the numbered bezel does not turn and is decorative only.

Oct 23, 2014 | Timex Tiex en T49825DH Expedition Military...

1 Answer

how do you use the tachymeter


Follow this link and learn:
http://www.mydigitallife.info/2006/12/10/how-to-use-tachymeter-function-on-watch-bezel-usage-instruction-and-definition/

Aug 06, 2010 | Timex 22991 Wrist Watch

1 Answer

The black plastic ring, w/ white markings (bezel ?), that goes on the metal (dial) which moves around, fell off. Is this part avail., and if so, for how much ?


This part is called the bezel, you are correct. They are available to buy as a separate item for certain watches, but not all. You didn't mention what type of watch it was. Most major brands, like Rolex, Omega, Tag Heuer etc all sell bezels for their watches, brands though like Diesel, Rotory, Seiko etc, do not sell bezels as a stand alone item. Should you wish to let me know the make and model of the watch, I will see if I can obtain one, or failing that I will see if I have one that will fit.

Apr 24, 2010 | Casio Marine Gear AMW320D9EV Wrist Watch

1 Answer

How do you use the tachymeter feature on my Expedition T45941? Is the bezel suppose to rotate, if so what direction? My bezel is not able to rotate.


I have looked at the instructions for your watch and was not able to find any reference to "tachymeter. Is there another name for this feature?

If you read through the instructions you will see that it mentions some watches have a rotating bezel but not all.

You can see a copy of the instructions by going to "timex.com" and at the bottom of the page is menu, select "manual/downloads", at the next page select "product manual downloads".

Put your watch type (T45941) in the search box and you will be presented with alternative versions. Choose one and download.

Jan 28, 2010 | Timex Watches

1 Answer

rotating outer ring


It is primarily cosmetic - the bezel was originally designed for diving, military activities or similar where counting down time was critical. Before digital stopwatches etc were built into watches as a feature, what you did as a diver was turn the bezel to the time (say 30 minutes) of air you had left, then the minute hand would travel around the face to the position 0 on the bezel, telling you 30 minutes had passed. You often find compass directions, various job specific calculators etc on bezels also, but unless you need a stopwatch / time reminder and don't have that feature in the watch itself, then it is purely a tradition to include a rotating bezel. The original bezels would have the time markings going the opposite way to the watch face usually, however on many modern watches, they often go the same way, allowing you to see how much time has passed, rather than how much you have left. Hope this clears things up :)

Mar 31, 2007 | Fossil CH2332 Wrist Watch

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