Feature: 1. 30MHz-3GHz Frequency Response: The frequency response of the probe is relatively flat in the range of 30MHz to 3GHz and is used to measure the magnetic field in the development phase 2. Comprehensive Function: Large diameter probes have high sensitivity but low directional resolution, while corresponding small diameter probes have low sensitivity but high directional resolution 3. Without Burrs: Near field probe is one piece molding without burrs, possess smooth surface and fluent installation 4. Impact Resistance: Good quality ABS material, possess impact resistance, scratch resistance, environmentally friendly 5. 4Pcs in Total: The package contain a total of 4pcs of probes, which can fully meet your using needs Specification: Item Type: Near Field Probe Material: ABS Operating Frequency: 30MHz to 3GHz. Package List: 4 x Near Field Probe Note: In use, the large size probe is usually used to determine the approximate area where the interference source is located, and then the small diameter probe is changed to narrow the search range, and gradually identify the source of the interference magnetic field in the electronic module.