output green laser wavelength is 532nm, the diameter of the light point is much shorter after focalization, the energy is denser, the efficiency of transformation from electricity to light is higher, the quality of laser beam is better. The whole machine is well-protected, and the marking is convenient to control. It is suitable for the fine marking & etching of various metal and nonmetal materials. It is especially suitable for the fine marking & etching on the surface of several rigid and brittle materials such as jewelry, bowlder, agate, crystal, glass, pottery & porcelain, gold, silver, copper, platinum, rare metals, alloy, and etc. Also it is used for the fine marking & etching of plated, spray-painted, plastic or silica gel products. The marking & etching is fine and speedy.