Which of the following error comes under personal errors?

Which of the following error comes under personal errors? Correct Answer Inaccurate bisection of signals

Instrumental errors are those which arise due to the faulty adjustment of the instrument e.g the needle not being perfectly straight, sluggish needle etc. Inaccurate centring, Inaccurate levelling of compass box, Inaccurate bisection of signals etc comes under personal errors.

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