The AEMC 500 is a general-purpose average sensing professional clamp-on ammeter. Measures 400A AC, 600VAC, Ohms and Continuity.A strong mechanical case design, quality materials, full ranges and compliance to international safety and quality standards ensure a professional and reliable tool. The Model 500 is auto-ranging, and provides the user with AC Volts, AC Amperes, resistance, and continuity. The large and complete 4000-count LCD features comprehensive user interface symbols such as a low battery indicator. It is equipped with a Data Hold function, which freezes the measurement. The Model 500 is compact for comfortable one-handed operation, and the hooked jaw design is easy to maneuver in crowded wiring and breaker panels. The jaw opening for the Model 500 is 1.1” (28mm).