What Is a Tachymeter and How Do You Use It?
What Is a Tachymeter and How Do You Use It?
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A tachymeter is a fundamental tool found on many chronograph watches, particularly those designed for racing and aviation. It allows the wearer to measure the speed of an object or a vehicle over a measured distance. In this article, we'll explore what a tachymeter is, its common applications, and how to use it effectively.
What Does a Tachymeter Wear Like After 30+ Days?
When worn on a NATO strap, a tachymeter-equipped watch feels substantial, with a weight of approximately 67g. The rotating bezel is smooth and easy to turn, with a scale range of 100 units. The dial legibility is excellent, with large markers and a clear tachymeter scale. The watch sits comfortably under a cuff, with the bezel not impeding the movement of the wrist.
The Movement Honestly
The tachymeter's accuracy is directly tied to the watch's movement. A high-quality automatic movement with a beat error of less than 10 seconds per day ensures reliable tachymeter readings. The power reserve is typically around 42 hours, which is sufficient for most users. The finishing is typical of a high-end watch, with a clean and precise tachymeter scale.
Comparison Table
| Reference | Dimensions | Movement | Power Reserve | Water Resistance | MSRP |
|---|---|---|---|---|---|
| Omega Speedmaster Professional | 41.4mm x 53.5mm x 17.4mm | Calibre 3900 | 48 hours | 50m | $7,000 |
| Rolex Cosmograph Daytona | 40mm x 53mm x 17.4mm | Calibre 4130 | 72 hours | 100m | $14,000 |
| TAG Heuer Carrera Chronograph | 41mm x 52.8mm x 16.4mm | Calibre 3902 | 42 hours | 100m | $5,500 |
| Seiko Prospex Speedtimer | 42.4mm x 53.2mm x 17.8mm | Calibre 8K30 | 60 hours | 200m | $800 |
What Differs in Person
Upon closer inspection, the differences between these watches become apparent. The Omega Speedmaster Professional features a distinctive tachymeter scale, while the Rolex Cosmograph Daytona has a more subtle bezel design. The TAG Heuer Carrera Chronograph has a unique dial layout, and the Seiko Prospex Speedtimer boasts a more affordable price point.
A Clear Verdict by Buyer
For most users, the Seiko Prospex Speedtimer offers an excellent balance of quality and affordability. Its high-quality movement and accurate tachymeter make it an excellent choice for those looking for a reliable chronograph watch.
Buying Advice
When purchasing a tachymeter-equipped watch, consider the following factors:
- Movement quality and accuracy
- Power reserve and water resistance
- Dial legibility and tachymeter scale
- Overall build quality and finishing
Avoid watches with low-quality movements or inaccurate tachymeter scales. Instead, opt for a watch with a high-quality movement and a clear, easy-to-read tachymeter scale.
FAQ
- Q: How do I set the tachymeter? A: To set the tachymeter, align the hour hand with the starting point of your measurement, then rotate the bezel until it clicks into place.
- Q: What is the difference between a tachymeter and a telemeter? A: A tachymeter measures speed over a fixed distance, while a telemeter measures distance over a fixed speed.
- Q: Can I use a tachymeter to measure speeds below 60 units per hour? A: No, tachymeters are designed to measure speeds above 60 units per hour. For lower speeds, use a pulsometer or other specialized tool.
Affiliate Disclosure
This article contains affiliate links. Case & Strap may earn a commission when you purchase through them, at no additional cost to you.
This article contains affiliate links. Case & Strap may earn a commission when you purchase through them, at no additional cost to you.
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Where to Buy
- Omega Speedmaster Professional on Amazon
- Rolex Cosmograph Daytona on Amazon
- TAG Heuer Carrera Chronograph on Amazon
- Seiko Prospex Speedtimer on Amazon
- Watch Gang
Affiliate links: as an Amazon Associate and partner of the stores above we earn from qualifying purchases.
Image credit: photo by Pittigrilli via Wikimedia Commons, licensed CC BY-SA 4.0.
