Some SMD components are very small and inconvenient to test and repair with ordinary multimeter pens. One is that it is easy to cause a short circuit, and the other is that it is inconvenient for the circuit board coated with an insulating coating to touch the metal part of the component pin. Here is an easy way to tell everyone, it will bring a lot of convenience to the detection.
Take the two smallest sewing needles, (Deep Industrial Control Maintenance Technology Column), close them to the multimeter pen, then take a thin copper wire from a multi-strand cable, and tie the pen and the sewing needle to the Together, use solder to solder firmly. In this way, there is no risk of short circuit when measuring those SMT components with a test pen with a small needle tip, and the needle tip can pierce the insulating coating and ram the key parts directly, without having to bother to scrape the film.