Hi Mattin,Definitely doesn't look like something to worry about here: these are notscientifically calibrated gauges and should be used as a guide not a precisioninstrument. Atmospheric pressure changes from day to day enough to mean that in differentconditions the needle might read slightly under 100% vac and then even slightlyover. Even if you use the glycerine filled gauges that Fred's talking about then thiswill still be the case; glycerine is in there to stop the needle bouncing insituations where the pressure oscillates (not the case when you have acatch-pot acting as an air receiver) which can make the needle difficult toread. Glycerine filled gauges are much less prone to damage though andso are certainly not without merit.Sometimes, you'll also find that you get a tiny amount of 'stiction' on theneedle and a gentle tap on the gauge can re-correct the needle slightly.Anyone, the bottom line is that if you're ready about 99% on a basic gauge andyour project is holding vacuum then you're good to go.All the best, Matt