General Technologies Corp GTC TA110 Laser Tachometer and Counter State of the art patented ergonomic design allows to simply attach a small piece of reflective tape to the shaft or rotating part, aim the laser beam to the reflective mark and read the RPM or revolutions count on the large display Measures from 1 to 99999 RPM with 0.05 percent accuracy and a 2 to 20 inches (50 to 500 mm) measuring range Quick selection between RPM and count functions and has Maximum and minimum memory recall functions as well as continuous reading and data hold modes Large LCD display with symbols and backlight and Quick response time less than 0.3 seconds Laser powered optical system is easy to use under all light conditions; only setup required is a reflective mark on the rotating part