Extech MA3018 CAT IV TRMS 3000A AC Flex Clamp Meter Digital is designed with a unique 18" flexible jaw clamp that easily wraps around bus bars and cable bundles that are normally difficult to access with standard clamp meters. The Extech MA3018 features True RMS measurements, a thin 7.5mm diameter cable for tight areas, 3000 count backlit LCD display, and more.