中间的旋钮可以旋转很多位置，你必须选择一个所需要的量程来作为测量量程。
The central knob has lots of positions and you must choose which one is appropriate for the measurement you want to make.
中间的旋钮可以旋转很多位置，你必须选择一个所需要的量程来作为测量量程。
The central knob has lots of positions and you must choose which one is appropriate for the measurement you want to make.
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