AEMC 503 Clamp-On MeterClamp On Meter Model 503 The Clamp on Meter Model 503 is a general purpose professional clamp on. 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 503 is auto ranging, and provides the user with AC Volts, DC Volts, AC Amperes, DC Amperes, resistance, and continuity. The large and complete 4000 count LCD features comprehensive