Answer
0.428 in.
Work Step by Step
We have 4 numbered divisions on the barrel:
$4×0.100~in=0.400~in$
We have 1 small division on the barrel:
$1×0.025~in=0.025~in$
The head reading is 3:
$3×0.001~in=0.003~in$
Thus, the total measurement is:
$0.400+0.025+0.003=0.428~in$
