This involves the selection of the crystal head. Because the price of the crystal head is not expensive, there are mixed fish and dragons on the market. In fact, you can refer to the following standards when purchasing.
(1) Look at the transparency: choose high purity, transparent and bright, take a few and bump them in your hand, there will be a crisp sound.
(2) Look at the plastic port: Squeeze the hollow part of the crystal head by hand, if the deformation is obvious, the quality is not up to standard. There is also the number of times the plastic shrapnel is bent, it is not easy to break, and it will not deform after being loosened.
(3) Look at the insert: whether the cutting edge of the metal terminal part is neat. Good crystal head reeds are golden yellow, while inferior products are oxidized and dull in color. → If it is suitable for an industrial grade, it mainly emphasizes the shielding effect, and the gold-plated contacts and installation process are more stringent.
