Received my gauge. At first I was wondering why it wasn't reading my air pressure using the presta valve, but I figured it out. The thing I was doing wrong was, I completely backing out the presta valve screw. I needed to not back it out completely, so that the tip can press against the inside nipple on the gauge. This is so much more convenient and I don't need to use the presta to shrader adapter anymore. Also, its light and easy to carry in my camelbak.