... It's applicable for the fields of automobile motorcycle parts, merchanism,petroleum,aeronautical and space,electric apparatus,steel,metal ... on bodywork of motorcycles,nameplates,connecting rods,engines,mechanical parts,machine tools,metal pipe,gear,pump,valve,fastening ... for adjustment,character size covers 2-80mm,even bigger Impact frequency 200—400HZHardness of work-pieceHRC≤60Repeat Precision±0 ...