Pro Laser Photo TachometerFeatures 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. WARNING: This product can expose you to chemicals, including Lead and Di(2-ethylhexyl) phthalate (DEHP), known to the state of California to cause cancer or birth defects or other reproductive harm. For more information, vist - www.P65Warnings.ca.gov