PCB near-field probe, designed using a 4-layer FR-4 PCB with striplines routed on the first inner layer, while the other inner layers are filled with copper. Compared with near-field probes designed with a 2-layer PCB, it can effectively reduce unwanted coupling and accurately locate interference sources. Usually, we use a larger one to detect the approximate location of the interference source, and then use a smaller probe to narrow the search range, gradually identifying of the interfering magnetic field in the electronic module. Combining these low-cost near-field probes with ULTRA allows for more efficient, accurate and flexible rectification than ever before, thereby increasing productivity! Typically, when these probes are connected to the tinySAULTRA, the tinySAULTRA's built-in LNA can be used to provide sufficient sensitivity without the need for an external LNA. If you do need an external LNA for weak signal detection, be sure to turn off the built-in LNA to avoid overloading the LNA. One 28mmH-field circular probe One 4.5mm H-field circular probe E-field probe Color: Black Material: Plastic+Copper Package Contents: 1 set * EMC near-field probe Only the above package content, other products are not included. Note: Light reflection 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.