How are your measurements for length mass and volume compared to the standards?

Answer 1

Your measurements must be in the same units as the system of standards in use.
The most widely used system of standards is called the SI system and all units are defined.
If your measurements are in the same units used then it is a simple matter to compare them.

Answer 2

Since I have lived. worked, and taught in the USA for 75 years , I must be familiar with both SI System and the American Engineering systems of units. Both systems have their own strong points and weak points. I do like to use g sub c in both systems to keep units straight.

SI g sub c : gc = 1.000 kg - m / N - s^2

American Engineering System gc : gc = 32.17 lbm - ft/ lbf - sec^2

I am proficient in the use of both systems.