I'm looking for help in determining the ranges I need to verify calibration of a new micro-balance. I am new to metrology and am wading hip deep in statistics right now, but I feel I have all of the information I need to establish pass/fail ranges for daily verification of calibration. The verification will be for Sensitivity, and the balance has a maximum capacity of 20g. I have calculated the minimum weight to be 0.0015g using the standard deviation from the Repeatability calibration (0.0000005) and the USP formula (3 x St. Dev) x 1000...so now I need tolerances. What am i missing here? Thanks in advance!