We have seen in the market most of the magnetizing cup with magnets, plus or minus pole points.
咱们在市场上所见到的磁化杯大多采用一般磁铁，正负极不分。
Linking method: Connect the electric needle instrument of plus or minus pole respectively on the needle handle, and exchange poles every time.
连接方法：将电针仪的正负极分别接在针柄上，每次将正负极交换连接。
Combination electrode in both the plus and minus pole can stably work, have smaller electric resistance, good conduct ability and strong the anti-decays ability.
组合电极在正负极都能比较稳定工作，自身电阻较小，导电能力好，抗腐蚀能力强。
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