Hand-held tachometer with LCD (DT-105A) or LED (DT-107A) for accurate contact measurement of revolution of engines or shafts as well as surface speed and length e.g. belts and conveyer belts. It provides exact measurement of revolutions per minute, total revolutions, length and velocity with various metric and English units. Hand-held tachometer with automatic and manual memory (MAX, MIN, last and 10 seperate readings) for recall in display. This easy to use tachometer is housed in a rugged aluminum casing and has a thread for tripod.