Starrett PT05257 67956

Product Highlights

• Starrett blocks can be used to test Bench Top Hardness Testers
• Each block is serialized, with a certificate detailing the environmental conditions used to test the block
• Actual readings are given, with the averages of these readings: min. reading, max reading and a repeatability figure
• The blocks are calibrated according to ASTM E-18 standards, ANSI (NCSL) Z540-1, (ISO) 10012-1, ISO/IEC 17025 and Mil-std 45662A.
• Hardness test blocks are designed to be used on one side only
• Indents should be more than .010" from the centers of two indents or no closer to the block's edge than .040"