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- Grade AS-2 gage blocks supplied with a Mitutoyo certificate of inspection that the blocks meet American Society of Mechanical Engineers (ASME) B89.1.9
- Ceramic block for dimensional stability and thermal expansion resistance
- Square base for accurate wringing, to attain a height reference standard, and to make a dedicated inspection jig
- Nominal length (in inches) indicated with laser-etched, black characters
- Identification number etched in block for traceability
