parallax error

Question

Parallax error in reading scale minimized by:

RankGuru · Accepted Answer

**Parallax** is the apparent shift in position of an object (like a needle) against a background (the scale) when viewed from different angles.
- To avoid this, the line of sight must be **perpendicular** to the plane of the scale.
- Many precision analog meters use a mirror under the needle; the reading is correct only when the needle hide its own reflection.

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parallax error

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