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Meter accuracy

I recently purchased 2 little voltmeters they look like the sort that would go in a control or instrument panel they are connected with just 2 wires which provide the operating supply ( they light up green and red) however the green  one states it will work between 20and 500 volts and the red one between 60 and 480 volts. When they are both on the green one indicates normally around 241 volts the red one shows 235 volts why the discrepancy I know it's not much but makes you wonder if one of them is lying. Secondly I've noticed that the green one tracks voltage changes faster than the red one and that a few times the green one jumps down to 238 then up to 241 multiple times while the red one stays the same and I think can see a slight flicker in my filament lamps when this is happening incidentally both meters are connected to the same plug  a 2 pin 5 amp one
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  • I went to a youth club several years ago where they had a fan heater trying to cool down the DNO intake, someone had decided to put their large commercial kitchen all on the same phase as “that’s what the reqs requires”, that was very hot, with the neutral tail being significantly hotter than the line tail.


     Andy B.
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  • I went to a youth club several years ago where they had a fan heater trying to cool down the DNO intake, someone had decided to put their large commercial kitchen all on the same phase as “that’s what the reqs requires”, that was very hot, with the neutral tail being significantly hotter than the line tail.


     Andy B.
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