Accuracy is influenced by both precision and bias in the measurement process. To understand accuracy, one must understand bias, systematic measurement error, random measurement error, measurement error, and precision.
In accordance with the ASTM E74-13a standard, Morehouse reports the Lower Limit Factor (LLF) which is reported on page one of the calibration certificate and not uncertainty.
It is important to remember that not all calibration laboratories provide the same type of calibration service. For load cells calibrated in compression there may be a noticeable difference in output.
When you make a first measurement, everything looks fine. It is when you make a second, repeated measurement and it is different from the first measurement that doubt begins to arise. Which one is the correct measurement?