用于保；さ缂魈，，阻遏外界杂质、水汽与碰撞滋扰，，结构细密、绝缘性好，，包管电极检测与事情状态稳固可靠。。

It is used to protect the electrode body from external impurities, moisture and collision interference. With precise structure and good insulation, it ensures stable and reliable detection and operation of the electrode.