AiraceUSA Bike High-Tech LCD Digital Tire Gauge, 300 psi Unit switch function button between PSI, bar and kg/cm2 Unit switch function button between PSI, bar and kg/cm2 Unit switch function button between PSI, bar and kg/cm2 On each side of the gauge head, there is a Presta air valve and a Schrader valve Unit switch function button between PSI, bar and kg/cm2