Umarex Notos air gauge accuracy.

Just curious if the stock pressure gauges on these guns are typically accurate or ever known to have problems? Only reason I ask is I went yesterday and had my SCUBA tank filled at my local fire department. I was standing right there and they got the tank to exactly 3000 PSI, with their sophisticated equipment. I assume given the nature of their job, their equipment and gauges are accurate. When I took it back home and topped my gun off the gauge on the gun only shows 2600 PSI. Didn't know if this is unheard of or not?
 
Depending on how fast they filled your tank, it can get pretty warm... then once it cools down, the fill pressure reduces... so you could've had it up to 3,000 but then down to 2,800 when it cooled off. and you used some air to fill the Notos plenem down to 2,600... give or take... could be part this issue and part the difference in the accuracy of the gauge as you suspect...
 
Depending on how fast they filled your tank, it can get pretty warm... then once it cools down, the fill pressure reduces... so you could've had it up to 3,000 but then down to 2,800 when it cooled off. and you used some air to fill the Notos plenem down to 2,600... give or take... could be part this issue and part the difference in the accuracy of the gauge as you suspect...
This right here. I know sone places will fill some then let cool for a bit then fill so,e more. Back when I was into paintball I would usually jest drop foo my air tanks the just pick them later. Next time you go get the tank filled up see if you can drop it off then just pick it up later if they can fill in 2 or 3 stages.
 
Some day, if budget allows, might consider 4500psi SCBA fireman's tank, seems to be a popular choice for PCP owners. WM
This is just my opinion. I would get a small compressor first. Something that you can plug in at home or your vehicle. However you do need to consider what you have for an airgun/s . Some simply will not take air if empty unless you can give them a quick shot of high pressure to seat things. In that case you would need a bottle. Some airguns you can simply cock to release tension off of the hammer spring and fill ever so slowly with a hand pump when totally out of air For example. others you can pump a hand pump like a madman fast enough to get things to catch and seal. Others, good luck without a tank of HPA.
 
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