The clever thing about the PASCA Tire Gauge is that it’s handy enough to loop into your car key ring. The gauge is easy to use and the LCD displays the tire pressure quite precisely. As the designer explains, “taking advantage of the fact that the driver will at least have the car key on hand all the time, we think we should just use the driver’s keys as the handle, and use a simple push action to insert the gauge to your tire valve.”