The HZ540/550 are the ideal toolkits for the investigation of RF electromagnetic fields. They are indispensable for EMI pre-compliance testing during product development, prior to third party testing. The sets include 3 or 5 hand-held probes with built-in pre-amplifier covering the frequency range from <1 MHz to approx. 3.000 MHz. The probes of the basic set HZ540 include one magnetic field probe, one electric field probe, and a high impedance probe. In addition to the HZ550 features an optional µ-magnetic field probe and an antenna. All probe outputs are matched to the 50 O inputs of spectrum analyzers or RF-receivers.