When you’ve got the need to know angular speed, you need a device to measure it. That device is a tachometer. And the most useful tachometer is the non-contact photo-tachometer.

The tachometer displays engine speed in revolutions per minute, and it can be useful in cars where there's a provision to control automatic-transmission gear changes.

The tachometer displays engine speed in revolutions per minute, and it can be useful in cars where there’s a provision to control automatic-transmission gear changes.

Using a tachometer to test a motor’s speed when disconnected from its load and again when connected to its load can make the difference between accurately calling the job done and leaving a motor ...

This tutorial will guide you through the process of building a tachometer around an Arduino. Tachometers are used to measure rotation rate in Revolutions Per Minute (RPM). You don’t need much… ...

This Arduino based little digital tachometer was originally created for counting the speed of turntables and fidget spinners. There is another application to consider – a rear wheel tachometer for ...

What do you think? — Bill A: There’s no real reason a car with an automatic transmission needs a tachometer. You can drive that car 200,000 miles and never need to know what the engine speed is.

The tach should have a low-scale readout that is sensitive to increments of at least 50 rpm. Use the tach to help you adjust the idle mixture screws evenly to create the highest idle speed.

SafeGauge SafeTest Wireless Tachometer Series This solution removes technicians from the live work area while measuring the speed of fans, pumps, drill heads and other rotating machinery components.