cts for the micro switch are smaller than micro (smaller than a pin head), or soldering in a narrow space, revising the tin bridge emerging from chip soldering. It makes soldering work delicate and easier.
Preservation method :
Easy to clean, use the sponge to polish the surface. Please do not leave them exposed to the air, better wrap them with tin. Don't leave your iron tip running for hours and hours if you are not using it. This can make the tip get black oxide cover. (If you leave it on to