Focused, high intensity Class II Laser beam can detect RPM readings from up to 6 feet away, improving safety near moving engine parts. Improved design with ergonomic shape and continuous backlit LCD display; great tool for easy and accurate measurement of RPM. Memory functions capture maximum, minimum and last reading. Applications include: diesel engines, gasoline engines, outboard engines, marine engines, small engines, snowmobile engines, industrial engines and more. Professional grade test instrument; carrying case, battery and instructions included Premium photo tachometer detects RPM readings with a 0 to 99,999 RPM range. Focused laser beam allows longer detection distance up to 6 feet. Easy to use and with an accuracy rating of +/- 0.05% +1 digit. Easy to see 5 digit display with continuous backlighting. Sampling rate of 2 readings per second.