It is a shame the valve on this pump is so terrible. The pressure dial is large and easy to read, but that is the only good thing on this pump. The valve on this pump is useless for presta valves. It is very difficult to get on and even harder to remove. In fact, it just tore the stem off a tube as I tried to inflate it. Terrible product and complete waste of money.
The head is super tight , if you use a threaded presta stem it's a knuckle buster to remove. The gauge is accurate within 50% . In other words pumping over 100 psi will blow your tire off the rim.
The purpose for buying was for the presta valve and try as I may,it would not stay on for the pressure making it worthless. Sorry guys.