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Measures the rotational speed with a visible red light beam from a powerful laser. It is a great tool to measure the RPM of motors and machine parts. In wood and metal working it can be used to accurately measure the speed of a lathe or milling machine. Can be used for HVAC applications in measuring fan speed. -Detection distance up to 6 feet. -Highly accurate, digital laser photo tachometer. -To take the measurement, apply a reflective mark (included in package) onto the target object, aim the laser beam at the mark, the RPM displays on the LCD screen. -Powered by 1 x 9V Battery (not included). -Size : 131 x 70 x 29 mm.