The iFixit USB Mini Voltmeter is a compact diagnostic tool that measures voltage (3V–9V) and current (0A–3A) in real-time, helping you quickly identify faulty chargers, damaged cables, and failing batteries. With a bright red LED display, universal USB-A compatibility, and battery-free operation, it delivers instant troubleshooting without extra gear. Built in a durable translucent blue casing with ±1% accuracy, this professional-grade tester is essential for technicians and repair enthusiasts who demand precision and reliability.