Hi i would just like to know whether any of you guys out there have experienced the same thing as me, also if you have a cause for this problem and what it could be,

When using a torr gauge while vaccing out a a/c system usually splits, i have noticed once the vac has come down to about 0.80torr it sometimes seem to fluctuate going from 0.80 to 0.82 0.85 upto around 0.90 then back to 0.80 and going up and down in that region, this is after a 45bar pressure test for an hour or so with no drop in pressure.

Anybody know that can be the cause of this and is it a big problem?

Thanks