The AT 5 automotive tester / handheld tachometer is a portable compact device used to measure revolutions per minute (rpm) in one-cylinder two-stroke and eight-cylinder four-stroke combustion engines with electric ignition starters. The AT 5 handheld automotive tachometer features an easy-to-read, backlit digital LCD display and flashlight functionality for low-light applications. When the inductive clip is placed on the ignition cable, revolutions are measured quickly and easily. Compatible with motorcycles, cars, trucks and more, the AT 5 rotation meter is a versatile tool for use in garages, repair shops, factories and research and development (R&D) laboratories alike.