What makes them target 6

The pressure gauge is relatively accurate, coincides with the air pressure equipment from the gas station. It is a bit small and the mark for the desired target pressure is slightly lumpy, but served its purpose.
The handle fits comfortably in your hand. I had with my wife after the change of wheels 4x1.5 Bar re-inflation, then one needs no more gym, but I had no bubbles or the like.

Strong buy recommendation. Price / performance ratio is absolutely justified.