Laser Tachometer
This small pocket tachometer uses reflective tape placed on any rotating device and then uses a laser to count the RPMs as the tape passes it.
It is extremely accurate, easy to use and useful if you need to know how fast anything is spinning.
We used this to calibrate our centrifuges to accurate RPMs and G-Forces.
While it is listed as a prop, it can be used on a video shoot for many uses by mechanics and engineers.
