How is the accuracy rating of NIST gage blocks described in the material?

How is the accuracy rating of NIST gage blocks described in the material?

• A. Graduation closest to a thimble scale graduation
• B. Accuracy grade A
• C. High-precision class AA
• D. Tolerance class B

Answer: (A)

The key idea is how the material defines the accuracy rating for NIST gage blocks: it’s described by which graduation on the block is closest to a graduation on a thimble-scale reference. This ties the block’s stated size to the finest mark you’d read on the measuring instrument’s thimble scale when comparing or using the block, so the rating reflects how closely the block’s dimension aligns with that reference mark. In practice, you’re reading and confirming size by matching to the nearest thimble-scale graduation, which is why this description is used. The other phrasings imply fixed grades or tolerance classes, which aren’t how the material describes the accuracy rating.

The key idea is how the material defines the accuracy rating for NIST gage blocks: it’s described by which graduation on the block is closest to a graduation on a thimble-scale reference. This ties the block’s stated size to the finest mark you’d read on the measuring instrument’s thimble scale when comparing or using the block, so the rating reflects how closely the block’s dimension aligns with that reference mark. In practice, you’re reading and confirming size by matching to the nearest thimble-scale graduation, which is why this description is used. The other phrasings imply fixed grades or tolerance classes, which aren’t how the material describes the accuracy rating.