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What is the length of electronic precision levels?

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What is the length of electronic precision levels?

(a) 100 mm

(b) 200 mm

(c) 300 mm

(d) 400 mm

I have been asked this question in an online interview.

Question is taken from Spirit Level topic in section Linear Measurements of Engineering Metrology

1 Answer

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Right answer is (b) 200 mm

The explanation: Electronic precision level is of about 200 mm length with 0.01 mm/m numerical division. Measuring range of electronic precision level is ±1.99 mm/m. It shows the stability of the indication after 3 seconds.

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