Answer
68.45 mm
Work Step by Step
The first mark to the left of the 0 is:$\ \ \ \ 68\ \ \ \ \ \ $ mm
The mark that most nearly lines up is:$\underline{\ \ \ 0.45\ }$ mm
The total measurement is:$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 68.45\ $ mm