What common source of potential error affects distance readings taken with a standard retractable tape measure?

Answer

The hook at the end can have varying amounts of "play" or slack.

The slack or play in the hook mechanism causes internal measurements (where the hook pushes against a surface) to differ in accuracy from external measurements (where the hook catches the edge of a surface).

What common source of potential error affects distance readings taken with a standard retractable tape measure?

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