The Power Probe The Maestro Automotive Circuit Tester is a high-quality diagnostic tool designed for automotive use. It features a built-in voltmeter and comes with probes included for easy testing. This advanced diagnostic tool is backed by a warranty from the manufacturer, Power Probe, ensuring its reliability and durability for years to come. The Maestro Automotive Circuit Tester is a must-have for anyone in the automotive industry looking to accurately diagnose and repair electrical circuits.