This Amprobe combination contact and non-contact tachometer measures rotational and surface speed of motors, conveyor belts, and other moving systems. Contact measurements can be taken in revolutions per minute (RPM), meters per minute, feet per minute, or yards per minute, while non-contact measurements can be taken in RPM. All measurements are accurate to + or - 0.1%. The tachometer has a 15 x 33mm (0.6 x 1.3 inches) LCD display that presents test results and unit of measurement. Non-contact measurements are taken using an infrared beam function that works at a distance of 5 to 30cm (2 to 13 inches) from the target. The unit comes with cone and funnel contact tips for measuring shafts with center holes and flat-end surfaces. This Amprobe tachometer is designed for use by mechanics, mechanical engineers, and industrial equipment operators. SpecificationsWhats in the Box?