Features: 1. The R20 Near-Field Probe Set Includes 3 Passive Magnetic Field Probes From To Small, 2. The Probe Has A Relatively Flat Frequency Response Within 30mhz To 3GHz, Which Is Used To Measure The Magnetic Field In The Research And Development Stage; And An Electric Field Probe. 3. The Magnetic Field Probe Is Also Sensitive In The Low Frequency Band. The Detection Diameters Of The Three Probes Are 20mm, 10mm, And 5mm Respectively. 4. The Probe With A Diameter Has High Sensitivity But Low Direction Resolution, And The Corresponding Small Diameter Probe Has Low Sensitivity But High Direction Resolution. 5. When Using, Usually Use A -Sized Probe To Confirm The Approximate Area Where The Interference Source Is Located, Then Switch To A Small-Diameter Probe To Narrow The Search Range, And Gradually Identify Of The Interference Magnetic Field In The Electronic Module Description: Type: Probe Set size: 120 x 25 x 14mm Material: plastic colour: As shown Package Contents: 1 Set Test Probes 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.