The wire is made of metal and its cross-section has a diameter of about $0.8\,\text{mm}$.
(a)[1]
State which instrument should be chosen to measure the diameter of the wire.
(b(i))[1]
State how the instrument in (a) is checked to prevent a systematic error in the measurements.
(b(ii))[2]
State how the instrument in (a) is used to reduce random errors.
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