Megger dcm310320 current clamp meters megger 1000 304 the megger dcm320 digital clamp meter is ideal for use during the installation maintenance and checking of electrical systems and equipment it measures ac current up to 400a acdc voltage up to 600v and resistance to 20momega it also has a continuity buzzer supplied with a battery pouch and user guide megger 1000 304 dcm320 current clamp meter