The infrared beam makes phototach accurate, convenient, and easy to use. Also the beam is not affected by ambient light. The phototach is the ideal tool for applications where electronic RPM pickup is not available.It features a wide measuring range and high resolution, 2.5 to 99,999 RPM, with a large 5 digit display, auto ranging, min/max memory storage. Reflective tape placed on a revolving object can be measured at distances from 2" to 20".
View OTC 3660 Phototach Brochure