Compute the given question:
Question: The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it.
Part A: What is the smallest part of a centimeter that can be read with the following?
(a) A meterstick with markings at each millimeter.
(b) A digital caliper with a four-digit display.
I'm looking for a brief but thorough explanation, and an example.