[02/13/2015] NorthONE 數位胎壓計，NorthONE(TM) Digital Tire Pressure Gauge, 100 PSI, 4 Settings, Quickly and Accurately Monitor Tire Air Pressure for Cars, Trucks, Motorcycles and Bicycles，定價$18.99，目前特價$9.99 USD。Prime境內免運費 (學生可以免費試用Prime)。哪裡買:amazon。