What is a Tachometer?
A tachometer is an instrument used to measure the rotational speed of an object, typically a shaft or a wheel. The unit of measurement is usually revolutions per minute (RPM), which indicates how many full rotations an object makes in a minute. Tachometers are widely used in various fields, such as automotive, industrial machinery, aviation, and laboratory settings, where monitoring the speed of rotating equipment is crucial for performance and safety.
How Does a Tachometer Work?
Tachometers can operate using different mechanisms depending on their design, but the general principles remain similar. They measure rotational speed through contact or non-contact methods.
1: Contact Tachometers: These require direct contact with the rotating part. A probe or wheel is placed against the surface of the rotating object, and the tachometer measures how fast it is spinning.
2: Non-contact Tachometers: These use light or laser sensors to detect the rotation of an object without making physical contact. A reflective tape or marking is often placed on the rotating part, and the tachometer emits a light beam to detect the reflected signal, calculating the speed based on the time interval between light pulses.
3: Digital Tachometers: These use electronic circuits and microcontrollers to measure speed and display the data on a digital screen. Some advanced digital models can also offer data logging features, memory functions, and communication with other devices.
4: Analog Tachometers: These use mechanical components like gears and dials to indicate the rotational speed on an analog scale. The speed is usually displayed on a needle-based dial.
Types of Tachometers
Tachometers are classified based on their operating principles and the way they measure speed:
1: Mechanical Tachometers: Use mechanical linkages and gears to measure speed, often connected to the rotating part.
2: Electronic Tachometers: Utilize sensors (such as optical or magnetic) and electronic circuits to measure speed.
3: Contact Tachometers: Involve physical contact with the rotating part to determine its speed.
4: Non-contact Tachometers: Use light or laser sensors to measure the speed without touching the rotating object.
5: Stroboscopic Tachometers: Use a strobe light that flashes at a frequency synchronized with the rotating object, allowing the speed to be calculated by observing the flashing frequency.
6: Photo Tachometers: Use optical sensors that detect light pulses reflected from a surface on the rotating object.
7: Laser Tachometers: A subtype of non-contact tachometers that uses laser beams for accurate speed measurement, even over longer distances.
Applications of Tachometers
Tachometers have diverse applications across various industries, including:
1: Automotive: Monitoring the engine's RPM to ensure optimal performance and avoid damage from over-revving.
2: Industrial Machinery: Used to monitor the speed of motors, gears, and other machinery to ensure smooth operation.
3: Aviation: Essential for measuring the RPM of aircraft engines for safe operation.
4: Electric Generators: Helps track the rotational speed of generators to ensure consistent power generation.
5: Test Equipment: Used in laboratories to calibrate and test the RPM of equipment for precision applications.
6: HVAC Systems: Used to measure the speed of fans, blowers, and compressors to optimize airflow and energy efficiency.
7: Electric Motors: Monitoring motor speeds in applications like robotics, conveyor belts, and pumps.
Top 10 Highly-Rated Tachometers:
Tachometers are essential tools in various fields such as automotive repair, industrial machinery, and scientific research. These devices measure the rotational speed of a shaft, disk, or any rotating object, providing valuable data for maintenance, diagnostics, and optimization.
With so many options available on Amazon, it can be challenging to select the best tachometer that meets specific needs. This review compiles the top 10 highly-rated tachometers on Amazon, exploring their features, pros, cons, and user feedback.
1: Klein Tools ET140 Non-Contact Digital Tachometer
Features:
> Non-contact laser sensor
> Measures RPM from 2.5 to 99,999 RPM
> Includes a memory function to store up to 30 readings
> LCD display with backlight for easy readability
> Powered by 2 AAA batteries
Pros:
Accurate and reliable
Easy to use with clear instructions
Compact and lightweight
Great for DIYers and professionals alike
Cons:
May struggle with highly reflective surfaces
Verdict: The Klein Tools ET140 is a solid choice for those looking for an affordable, accurate, and easy-to-use tachometer. Its non-contact feature makes it ideal for measuring rotating parts without making physical contact.
2: Neiko 20713A Digital Laser Tachometer
Features:
> Non-contact laser technology
> Measures RPM, surface speed, and total measurement
> Range from 2.5 RPM to 99,999 RPM
> Backlit LCD screen for better visibility
> Comes with reflective tape for measuring hard-to-reach areas
Pros:
> Affordable
> Versatile measurement capabilities
> User-friendly design with a large, easy-to-read display
Cons:
> Not as durable as higher-end models
Verdict: The Neiko 20713A offers great value for money. It’s a great option for hobbyists and professionals who need a reliable tachometer without breaking the bank.
3: Extech 461860 Digital Handheld Tachometer
Features:
> Measures RPM and surface speed
> Contact and non-contact modes
> Features a clear LCD display with a backlight for easy reading
> Range of 2.5 to 99,999 RPM
> Memory function to store previous measurements
Pros:
> Dual-mode functionality for flexibility
> Accurate measurements with a solid build
> Includes both reflective tape and a contact adapter
Cons:
> On the pricier side
Verdict: The Extech 461860 is a top-tier option for professionals who need precise and versatile measurements. The dual-mode functionality (contact and non-contact) makes it an excellent all-around tachometer.
4: Tacklife HT100 Digital Tachometer
Features:
> Non-contact laser tachometer
> Measures RPM, surface speed, and length
> LCD screen with backlight
> Can store up to 10 readings
> Powered by 2 AAA batteries
Pros:
> Affordable
> Simple, easy-to-use design
> Decent accuracy for the price
Cons:
> Lacks advanced features like data logging
Verdict: The Tacklife HT100 is a great budget option for users who need basic tachometer functions. While it lacks some advanced features, it still delivers reliable performance for basic tasks.
5: INNOVA 3320 Digital Non-Contact Tachometer
Features:
> Non-contact infrared tachometer
> Measures up to 99,999 RPM
> Easy-to-read backlit LCD display
> Includes reflective tape for accurate measurement
Pros:
> Compact and lightweight
> High accuracy and fast response time
> Versatile for both automotive and general mechanical use
Cons:
> Limited memory storage
Verdict: The INNOVA 3320 is a reliable and compact tachometer that is well-suited for automotive applications. It offers excellent value with a range of useful features.
6: Digital Laser Tachometer by BTMETER
Features:
> Non-contact digital laser tachometer
> Range from 2.5 to 99,999 RPM
> Measures surface speed in meters per minute
> LCD display with backlight
> Comes with a reflective tape
Pros:
> Excellent value for money
> Accurate readings
> Lightweight and easy to operate
Cons:
> No memory function to store readings
Verdict: The BTMETER Digital Laser Tachometer is a great budget option that provides accurate readings for general mechanical use. It may not offer advanced features, but it performs well for everyday tasks.
7: Amprobe TACH-100A Digital Tachometer
Features:
> Non-contact digital tachometer
> Measures RPM, surface speed, and length
> Range from 2.5 RPM to 99,999 RPM
> Large LCD display with backlight
> Includes reflective tape and a contact adapter
Pros:
> Durable and built to last
> Accurate readings with multiple measurement modes
> Ideal for heavy-duty applications
Cons:
> Higher price point
Verdict: The Amprobe TACH-100A is a high-quality tachometer designed for industrial and professional use. While it's pricier, its rugged design and accuracy make it worth the investment for demanding tasks.
8: iTronics IT-8791 Tachometer
Features:
> Non-contact laser tachometer
> Measures RPM, surface speed, and total measurement
> Range from 2.5 RPM to 99,999 RPM
> LCD display with backlight
> Includes reflective tape
Pros:
> Affordable
> Lightweight and portable
> Simple to use
Cons:
> Lacks advanced features like memory or data logging
Verdict: The iTronics IT-8791 is an excellent entry-level tachometer. While it lacks some advanced features, it delivers accurate measurements for everyday applications at a budget-friendly price.
9: CEM DT-2236B+ Digital Tachometer
Features:
> Contact and non-contact measurement modes
> Measures RPM and surface speed
> Includes memory storage for up to 9 readings
> Backlit LCD display
Pros:
> Dual-mode functionality
> Accurate and reliable
> Affordable for its features
Cons:
> The contact mode requires a bit of setup
Verdict: The CEM DT-2236B+ is a great all-rounder, providing both contact and non-contact measurement modes. It’s ideal for professionals who need a flexible tachometer at a reasonable price.
10: Etekcity Laser Digital Tachometer
Features:
> Non-contact digital laser tachometer
> Measures RPM and surface speed
> Range from 2.5 RPM to 99,999 RPM
> LCD with backlight
Pros:
> Excellent performance at a budget-friendly price
> User-friendly design
> Ideal for basic measurements
Cons:
> Limited advanced functionality
Verdict: The Etekcity Laser Digital Tachometer is perfect for those who need a simple, reliable tachometer for everyday tasks without requiring sophisticated features.
Conclusion
Choosing the best tachometer depends on your specific needs—whether you're an automotive professional, hobbyist, or industrial technician. From budget-friendly models like the Neiko 20713A and Tacklife HT100 to high-end models like the Amprobe TACH-100A and Extech 461860, each tachometer offers its unique set of features, pros, and cons.
The key is to identify your priorities, such as accuracy, versatility, or ease of use, and select the tachometer that best meets those needs.
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