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Which of the following is incorrect about graduation scales?

(a) Scribed or etched marks are less preferable than paints

(b) Telescope internal gauge has two spherical contact rods

(c) Ball type plug gauge can detect ovality and taper effect

(d) Pneumatic hole gauges are used for precision hole gauging

The question was asked in an online quiz.

My doubt is from Graduated Scales in portion Linear Measurements of Engineering Metrology

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Right option is (a) Scribed or etched marks are less preferable than paints

The best I can explain: Scribed and etched graduations are more preferable than inks. It is for the durability and accuracy of graduations.

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