Sunsbell&reg;DT2234C+ Non-Contact Laser Photo Tachometer Handheld Digital RPM Meter Tool RPM of motors and machine parts with large LCD displaying Wide measuring range & high resolution,durable to use. Digital display gives exact RPM with on guessing or errors. It is a great tool to measure The item has been carefully designed to fit comfortably in either hand. In wood and metal working it can be used to accurately measure the speed of a lathe.