... , no poison, no noise, no dust, no pollution. 3.Full automatic safty device, stop the leakage of electricity, short circuit ... -engraving water could be cycle use. Comparision beteween BYT Metal Etching Machine and Traditional Corrosion Craft: Content BYT series ... are suitable and easy to be operated.Only some active metal is suitable,dangerous for the processingCraft Enviromental,some new decoration ...