用于；；；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。。
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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.