You should register it with the local Council's trading standards. They test them every so often and issue heavy fines if they are outside of the tolerance.
The gauges are so accurate they are set up so you always get 0.5% less than it says on the display which is the limit of the allowed tolerance, but this is quite a small error margin, unlike the larger margin you report.
Edited by Hamsafar on 19/02/2011 at 16:47
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