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。
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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