1: The minimum diameter of compact laser module is only 4mm (6mm for one word and cross line) 2: compact structure and small volume, easy to follow 3: Stable and reliable, price economy
1：紧凑型激光模块的最小直径仅为4mm（一字和交叉线为6mm） 2：结构紧凑体积小，便于按照 3：稳定可靠，价格经济
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