LABORATORY MATERIAL OR ACCESSORY; COMPONENT: BRINELL HARDNESS STANDARD BLOCK 240 TO 260 HBW 2.5/187.; APPLICATION: EMCO DUROMETER; FOR INDIRECT CALIBRATION OF HARDNESS TESTING MACHINES ACCORDING TO AS TM E10-ISO 6506-3 STANDARDS. THE AGENCY PERFORMING THE BLOCK CERTIFICATION MUST BE ACCREDITED ACCORDING TO THE REQUIREMENTS OF THE ISO 17025 STANDARD BY AN ILAC RECOGNIZED ACCREDITATION BODY (E.G. NVLAP); MANUFACTURER 1: WILSON