Which of the following methods is unreliable to evaluate the surface f

1.	Which of the following methods is unreliable to evaluate the surface finish?
A.	Electrical stylus profilometer
B.	Wallace surface dynamometer
C.	Profilograph
D.	Tomlinson surface tester
Answer» C. Profilograph

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Which of the following methods is unreliable to evaluate the surface finish?

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