R20 near-field probe group includes three passive magnetic field probes from large to small. The probe has a relatively flat frequency response in 30MHz to 3GHz, which is used to measure the magnetic field in the R & D stage; And an electric field probe. The magnetic field probe also has sensitivity in the low frequency band. The detection diameters of the three probes are 20mm, 10mm and 5mm respectively. The probe with large diameter has high sensitivity but low directional resolution, and the corresponding probe with small diameter has low sensitivity but high directional resolution. When in use, the large-size probe is usually used to confirm the approximate area of the interference source, and then the small-diameter probe is switched to narrow the search range and gradually identify the interference magnetic field source in the electronic module. Colour:black + green Material:ABS Size: 120 x 25 x 14mm Package Contents: 4 x test probe Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.