Sykes 300430 Infra Red Laser Tachometer 6558830 Vices are equipped with a 6559880 Vices are equipped with a convenient unigrip mechanism Includes hardened washers Infra red laser picks up signal from reflective tape which is placed on the rotating shaft Features bright and powerful laser optical system for easy targeting of rotating object even in bright daylight Measurements can be obtained from safe and comfortable distances from 5 to 50cm The large 5 digits display allows measurements without the need to switch scales or multiply reading ranges Unit comes complete with batteries and reflective tape in a soft carrying pouch