The Lang Tools 13803 Automotive Multimeter is a handheld battery operated professional automotive multimeter designed to provide troubleshooting solutions in today's sophisticated automotive electronic systems. The automotive multimeter measures AC/DC voltage, AC/DC current, resistance, diode, and continuity, as well as testing RPM, dwell, temperature, and duty cycle. The multimeter is designed specifically for technicians to provide basic automotive electrical tests and automotive specific diagnostic functions needed to maintain and troubleshoot today's vehicles.