Clamp meter adaptor for high currents. Connects direct to a multimeter or other instrument which measures mVac. The sensor is designed as a cable and has a snap lock. Ergonomically designed open/close mechanism which is easy to handle even when wearing safety gloves. Measures across the rail package, large cables, district heating pipes, etc. The sensor has a low weight because it has no iron core. No saturation effect. Unaffected by direct currents. Small phase shift. The frequency range is suitable for industrial frequencies and overtone analyses.