Just a couple of questions…
- what type of scales do you have and how old are they? Have you tested them to see if they are still in calibration? If your scales are old and not in calibration, one can use the scales in the fruit and vege part of a supermarket to measure weights are these are likely to be more accurate than domestic type scales.
- how do you measure the net weight? The best way to do it is to weigh the contents and container, then remove the contents and thoroughly clean the container to remove all residues, dry and then weigh the container. The net weight of the contents will be the first weight less the second measured weight. If you measure the contents scraped from the container, then there will always be resides within the container will be make the mass of contents less than what they should be.
For the product and do avoid duplication, this has been discussed in this other thread.
