measuring area and distance
测量面积和距离
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Hold the unit steady during measuring. Mark the area and distance from the appliance when the red LED is on. Read below for suggested corrective measures.
测量时将该设备放稳，当红色的LED亮时，量一下其距离，按照下面指示的读数校正测量。
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模块下移
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