SPARE PART FOR METROLOGICAL INSTRUMENT; COMPONENT: TUNGSTEN CARBIDE BALL; ADDITIONAL DATA: CLASS B ASTM E18-ISO 6508; EQUIPMENT: WILSON HARDNESS TESTER; HARDNESS INDENTER HRBW CLASS B, ACCORDING TO ASTM E18-ISO 6508 STANDARD, COMPOSED OF CAPSULE, SUPPORT AND TUNGSTEN CARBIDE BALL OF 1/16 INCH DIAMETER. THE CALIBRATION CERTIFICATE MUST BE ISSUED BY A LABORATORY COMPLYING WITH THE REQUIREMENTS OF STANDARD 17025 ACCREDITED BY AN INTERNATIONALLY RECOGNIZED BODY; MANUFACTURER 1: WILSON.