1.Multilayer Electronic Metal Detector PCB 2.UL,SGS,Rohs Certificate 3.Material based On ... Technical Specification For PCB Number of Layer1,2,4 or 6,upto 18 layerOrder Quantity1 to 50,000Board ShapeRetangular,round,slots ... AssemblyTechnical requirement for pcb&pcb assembly:---- Professional Surface-mounting and Through-hole soldering Technology---- Various sizes like 1206,0805,0603 components ...