Manufacturers of this kind of equipment only use the best quality materials in their
equipment which is guaranteed to stay accurate over certain periods. If anything goes wrong with the machine at any time, they usually have great service departments who will calibrate the machines to make them efficient once again. Once calibrated, they usually have a seal put on them to avoid tampering by personnel or customers so that the company itself cannot be blamed for any goods that are not measured properly. In this way, any government official can check to see who is to blame if there are complaints from members of the public about underweight goods of any variety.