m=mass

V= Volume

If we want to calculate the combined measurement uncertainty of the mass ?m?

There are three uncertainty sources, the repeatabilty, the readability and the contribution due to the uncertainty in the calibration function.

My question is related to repeatability ?s? of the balance.

İf I make ?n?(lets say n=10) measurement to determine repeatability of balance .

When combining uncertainty sources to calculate the combined measurement uncertainty of the mass ?m?

Should I use Standard deviation (S) or Standard deviation of the mean (Standard error)(S/^0,5 as repeatability component

Note: in routine analysis test sample is weighted only once

I need your comments