... 1Table 3-1 No.Type of impact deviceHardness value of Leeb standard hardness blockError of displayed valueRepeatability1D760+/-30HLD530+/-40HLD+/- ... cast iron, ductile iron, zinc alloy, copper alloy ,casting of copper, Copper alloy (brass, bronze), pure copper, forged steel . l Hardness Scale: ... printers, work quiet, can be printed arbitrary number of copies of test results.l Printing paper: width is ( ...