Compact, easy-to-read LCD display. Measures rpm from 0 to 15 in 10 rpm units. Displays tachometer within 0-20000 rpm range. Records max rpm. Dimensions: 34.3 mm (1.35″) H x 69.8 mm (2.75″) W x 17.3 mm (.68″) D. Uses an LCD screen powered by an inner CR 2032 changeable battery that allows installation on any vehicle.