... Best service 2. Realiable supplier 3. Superior product 4. Function test, RoHS, UL Welcome to Hangzhou Singo Tech Co.,ltd. ... parts list provided by customers * PCB board made, circuit board parts purchased by us * PCB board with parts assembled * Electronic testing circuit ... ,Nickle,Immersion Gold,Immersion Tin,Immersion Silver,OSP,etc.Board Thickness Tolerance±10%Copper Weight Tolerance± 0.25 ozMinimal ...