The SKS Airchecker Digital Display Pressure Gauge is a far cry from a squeeze and a "seems good enough" as you roll towards the door for a long training ride. In the same amount of time that you can wonder what your tire pressure is at, you can check it and know. SKS uses modern technology to make this happen. The Airchecker has a lit digital readout that gives you a reading in PSI or BAR. Simply push the 180 degree swiveling head onto the valve stem and you'll get an instantaneous reading that remains displayed on the screen after you remove the checker. It runs off of a standard CR-2032 battery. The SKS Airchecker Digital Display Pressure Gauge works with Presta and Shrader valves.