Answer
42.10 mm
Work Step by Step
The first mark to the left of the 0 is:$\ \ \ \ 42\ \ \ \ \ \ $ mm
The mark that most nearly lines up is:$\underline{\ \ \ 0.10\ }$ mm
The total measurement is:$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 42.10\ $ mm
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