With a ruler..... hahaha
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A centimetre should suffice.
A centimetre, although you could use a millimetre for greater accuracy.
Inches or centimetres are fine for a book's dimensions. Measure the width, height and depth to determine the volume. If you are talking about the length of the book's narrative, word count is probably the most accurate.
Measure the length and the width. Or if you are feeling particularly energetic, then one of them and the diagonal.
appropriate unit to measure the width of a textbook = ce ntimeters