... precision, it can engrave the fine image-text of 0.5mm-2.0mm quickly.It could work all day long ... without a break. 2.Working process is no pungent smell, no poison, no noise, no dust, no pollution. 3.Full automatic safty device, stop ... ratioVery low Very high PollutionNo pungent small , no dust , no noise ,no toxic hazard , no pollutionDo hard to health and enviromentWorking condition Small area Large ...