Why is graduation important for precision measurement? Graduation marks are the very tool used by the operator of a precision measurement tool. If they are inaccurate in any way, then the whole final measurement is affected. Due to this, they are a very important part of the precision measurement process. The smaller the distance between graduation marks, the greater the sensitivity that can be achieved by the instrument. The degree of accuracy of the graduation marks themselves, the amount of resolution of the marks, and the appropriately thin line used to mark a point all influence how close to 100% accurate the measurement can get. It is within the graduation marks on a measurement instrument that the power of accuracy lies. There is of course always room for observer error, but no outcome measurement would be accurate if the graduation marks used are misaligned.