This pump is total garbage. It does not work with any valve with a removable core. When you try to unscrew the pump from the valve it takes the core out with it and deflates the whole tire. In the end it actually broke the whole valve on my back tire in the middle of a ride. Now I get to take the whole rear tire apart and spend more money including a new pump. Absolute garbage.
I have not found any small pump able to achieve >80psi and doubt it is possible. That being said this pump is the best of the ones I have owned, very small, light, and has a built in valve stem tightener which is great since they often loosen up due to the screw on hose attachment.
I bought this pump as an impulse purchase due the size of the pump being easily fit in my jersey pocket. What was a unexpected benefit was how easily it attached to the valve stem and could be removed when pumping was completed. The pump also delivers good volume per stroke. Would recommend and buy again.