Hello, I've recently started work for a small company that has an in-house calibration facility for testing mass standards using Borda's substitution method. We are not accredited to 17025 but are working towards it and I'm learning on the job, so to speak. We hired a consultant who said that the results we report have 1 too many decimal places. The example he pointed out is a certificate for a 1 kg weight, calibrated on a 4 decimal place comparator. The results reported was 1 000.001 36. His argument is that as the comparator only has 4 decimal places, we can only report to 4 decimal places. He said the result should be 10 000.001 4, but I have a couple of problems with this. First, if he is correct about only using the readability of the comparator, then I'd argue that the 4th digit should not be rounded, as according to him, there is no 5th digit that exists to round it. Second, we are not using the comparator to weigh the standard, but we are using it to compare the standard to another (higher accuracy) standard (which has a reported result to 5 decimal places). As we are using Borda's method, surely the reported result is a calculation of averages and not a reading taken? To me it's like saying the average of 3+3+3 is 4 or 5, not 4.5. I'd be appreciative of anyone else's thoughts on the matter. I'm happy to be wrong, but I'd like to understand why. Thanks in advance.