Features and Benefits 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.