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What is the value of total error for grade 1 micrometer when micrometer is tested at 20oC?

What is the value of total error for grade 1 micrometer when micrometer is tested at 20oC? Correct Answer 4+(L/100)µm

Total error should not exceed 4+(L/100)µ m for ‘grade 1’ micrometer and 10+(L/50)µm for ‘grade 2’ micrometer when tested at 20oC.

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