Universal, economical tachometer measuring rotational or surface speed either in contact or non-contact way. Universal, economical tachometer measuring rotational or surface speed either in contact or ...

If you’re into anything even vaguely mechanical on the broad hacking spectrum, you’ve come into contact with things that spin. Sometimes, it’s important to know precisely how fast they are spinning!

It’s often necessary to measure a motor’s rotational speed without any physical contact with the motor or its shaft. Some methods use a mirror attached to the motor’s rotating part to reflect a pulsed ...