The MAC Tools ET-940 Solid State Tach Dwell is a high-quality diagnostic tool designed for automotive use. This unit, made in the United States by Mac Tools, features a solid-state design with clamp accessories for easy connection. With its analog display, it measures RPM, dwell, voltage, and resistance for precise engine testing. This durable and reliable tool is a must-have for any mechanic looking to accurately diagnose and troubleshoot vehicle electrical systems.