Question

justin wants to measure the thickness of a paper towel roll but his ruler is not the proper measuring device.using a full roll he takes the measurements

Answer 1

Vernier caliper

Explanation:

The paper towel is circular in shape, should he use the ruler he may come up with a value but the value may not be accurate.

Hence the measuring instrument Justin should use is a vernier caliper, which is a measuring device that can be used to measure the external diameter of the roll of paper