The SKS Digital Tire Pressure Gauge is an amazing tool for accurate and easy checking of tire pressure on either schrader or presta valve tires. With the proliferation of tubeless in all disciplines and the need by Cyclocross racers and others to dial in pressures to a 10th of a PSI, this is a valuable tool. The more research is done on rolling resistance, the more we see that knowing your tire pressure and maintaining it is crucial to maximize efficiency. Features: Lightweight at 45g Reduction button allows the pressure to be regulated exactly to one 0-140 PSI/10 Bar Duo Head is Presta and Schrader valve compatable