The RF-K 7-4 is a passive near-field probe. In contrast to the RF-U 5 near-field probe, the RF-K 7-4 H-field probe is shielded from field lines entering the probe head laterally. The near-field probe detects inhomogeneous magnetic fields enterimg through the bottom of the probe head. Superposed homogeneous fields are not detected by the special probe head. The RF-K 7-4 H-field probe is small and handy and functions like a coupling clamp. It has a current attenuating sheath and, therefore, is electrically shielded. It can be connected to a spectrum analyzer or an oscilloscope with a 50 Ω input. The H-field probe does not have an internal terminating resistance of 50 Ω.