Pogopin's real scientific name is "Spring Loaded Contact". It is a precision connector used in electronic products and is widely used between mobile phone antennas, batteries and mobile phone motherboards. In the design of precision anti-seismic components such as connections, the main role of Pogopin is to connect, effectively ensuring the data and current transmission between board-to-board, board-to-wire or other parts. The factory principle of pogopin is to change its working height through the compression and expansion of the spring to match the spacing between connected parts. The tension of the spring can ensure the contact strength between the parts to avoid gap breakage. The Pogo pin consists of roughly 3 parts. Needle, spring, needle tube, needle, and material are generally selected as Becu or SK. Both have their own pros and cons. Becu has good conductivity but lacks hardness, and SK has high hardness but is easy to rust. Spring is also more important. SUS SWP, especially now that there are more and more PB free products, directly causes the pins or BGA solder balls to become soft or hard. During the test process, it was found that the original yield was very high. After changing the solder ball or pin material, the yield rate is extremely poor. The selection of spring pressure is very important. The testing environment also has very strict material requirements for the spring. High and low temperature testing directly affects the working life of the probe. For needle tubes, there are many materials to choose from, and PB is generally used. The main reason for low yield may be caused by the increase in impedance during the testing process of the probe. The increase in impedance is mostly caused by the wear of the needle during the test, the damage of the plating, and the tin hanging on the needle. How to solve the problem of tin hanging on the needle shaft and the soft coating. Alloy coating can effectively solve this problem by increasing the hardness of the needle shaft and making the surface of the alloy material basically non-adherent to welding. The special Nanotek brush cleaning brush can effectively solve the problem of tin hanging. ?