... when short of water&high temperature ,will alarm co2 MDF laser engraving machine Proper Features:1) Scientific and advanced ... or painted metals. It is applicable to wood ,playwood ,MDF, ware ,plastics ,resin material,glass,painted metals,porcelain ... aluminum, rubber, fiber glasses ,plastic, printting rubbeplank, double color board, synthesize crystal, carton,etc. Applicable area:Advertising industry , ...