Most like a vernier caliper for accurate readings
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I think I saw that you tried to include that your units were in inches. this is not a metric unit to start. convert inches to centimetres. then multiply the length by the width to get your answer in cm^2, a metric unit
Inches or centimeters
Try using a triple beam balance, or a electronic scale. The units to measure the mass of the book would be in grams.
meters2
5 and 1/2 inches is a standard book width. Many are different sizes.