Megger DCM305E Earth leakage clampmeter The DCM305E earth leakage clamp meter is perfect for identifying and measuring the earth leakage current in a circuit where the RCD keeps tripping out unexpectedly. The measured result will quickly identify whether the earth leakage current present is excessive, causing the RCD to trip, or if the RCD itself is over sensitive or faulty. Specially designed to check earth leakage currents, the DCM305E is an efficient and highly versatile instrument. It has six ranges, 6 mA, 60 mA, 600 mA, 6 A, 60 A, and 100 A, with a minimum resolution of 0.001 mA on the 6 mA range. Its upper range also enables TRMS AC current measurements up to 100 A.