The pump has an opinion on everything. When trying to pump up the wheel, for example, from 240 to 250 kPa, he simply refuses to do it, saying, "it will do, 10 kPa is not significant." The pump categorically asks to set the required pressure higher than the user needs, i. E. in order to get, for example, 270 kPa, you need to set 280 on the display and nothing else, otherwise you will get 260 if you set 270. The quick-release head has such sharp corners and ribs and sits on the air valve of the tire so deeply and firmly that when it was first removed, the index finger was pierced to the blood - so much effort must be applied to remove the head. I may be handy, but this is far from my first pump in my 30 year automotive life, and I've never felt like wasted money before.