At the same time LED digital display real-time measurement of the diameter, a size adjustment knob, convenient and quick.
同时LED数码管实时显示测量直径，采用旋钮调节尺寸大小，方便快捷。
At the same time LED digital display real-time measurement of the diameter, a size adjustment knob, convenient and quick.
同时LED数码管实时显示测量直径，采用旋钮调节尺寸大小，方便快捷。
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