Review on Accurate and Convenient: Introducing the Topeak Smart Head Digital Air Pressure Gauge by Kevin Ayala

This is a piece of junk. The product feels cheap and the buttons to turn off and change units are right where your fingers want to be. You have to pull as hard as you can to get it off the presta valve, which tends to cut your fingers into the cog, or at least some of the spokes, at high speed. In addition to blood from the joints, this device also releases a lot of air when reading. Sometimes it just works, sometimes you don't get a reading no matter how you tilt it. While I've had better luck getting repeatable readings with the Schrader adapter on my Presta valves, it only counts if you average the times it says a value and exclude the times it doesn't work at all. I bought this from a local bike shop that I wanted to trust and they gave me that. I figured I'd end up getting what the guys in the store use, something good; incorrect. I'd like to send it back because it's junk. My tip: Most good bicycle pumps have a sensor and are also cheaper! Buy a pump instead.