To keep the measurement light focusing on the measured surface, an automatic focus unit is very important.
要保证测量光聚焦在待测表面，自动聚焦控制是非常重要的。
Previewing by red light, focusing by double red lights, and equipped with LED lighting.
单红光预览，双红光对焦，配备LED照明。
Previewing by red light, focusing by double red lights, and equipped with LED lighting.
单红光预览，双红光对焦，配备LED照明。
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