What do you mean by "exact measurement"? Do you wish to determine the cylinder's height? Its diameter? Its surface area? Its volume?
You can find the exact surface area for all of those shapes.
Use a caliper that's made for inside measurement.
because its round and it doesnt have any edges
Impossible to answer. You'd need at least one other measurement.
Is as exact as possible
You can find the exact surface area for all of those shapes.
The exact bore measurement is 101.6 mm.
Ask an optometrist
If you measure properly, the amount of water does not change. Measurement with whatever graduated cylinder you choose will not alter the amount of liquid measured. Most people choose to measure once with a larger one, but if the amount of liquid falls between the measurement lines, you can measure the "leftover" with a smaller cylinder and find the exact answer.
41.3 is an exact measurement.
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Use a caliper that's made for inside measurement.
Because of the cylinder's circular shape, its surface area includes a multiple of pi. Because pi is an irrational number, you can not express its exact value numerically. The fact that you can't express it numerically does not however mean that you can't express it at all. For example, a cylinder with a radius of 1 centimeter and a height of 1 centimeter will have a surface area of exactly 4π centimeters.
It uses smaller segments of measurement making it more accurate
The unit of measurement that a graduated cylinder uses is the volume/mass of water.
because its round and it doesnt have any edges
The difference between a measurement and an estimation is that a measurement is an exact data while an estimation is a guess as to what something may measure. For example, you can use a ruler to get the exact measurements of a piece of paper. However, if you don't have a ruler, you can make an educated guess as to what the paper's length and width measurements may be.