測直流電的鉗型儀器，幾十年前就有了。我用過一個HP的，不過很貴，至少1～2千。

來源: 原上草2017 於 2023-11-08 12:13:32 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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