The air pressure tester shows 3.0 on the tank. Should be 2.6 and since I haven’t checked for a long time, the truth should be 2.4 or 2.5. That’s annoying! So I googel after a reasonable device, not such a € 3,- China scrap and hit this: https://www.amazon.de/…/ref=sr_1_3?… Purchased and found very good. That’s still good German quality work. I have my fun on these things. W.