How can parallax error be avoided?

Answer:
To help the user avoid this problem, the scale is sometimes printed above a narrow strip of mirror, and the user positions his eye so that the pointer obscures its own reflection. This guarantees that the user's line of sight is perpendicular to the mirror and therefore to the scale. Parallax is thus avoided.
First answer by ID2057595322. Last edit by ID2057595322. Question popularity: 2 [recommend question].

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