Answer
$$ -2.81 \ mm.$$
Work Step by Step
The small needle reads $-2.00~mm$ and the larger needle reads $-0.81 ~mm$. Hence, the final reading is $$-2.00 \ mm-0.81 \ mm= -2.81 \ mm.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 4 - Section 4.9 - Reading Scales - Exercise - Page 203: 8
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