The Mini Digital Tire Gauge is compact and accurate! Measuring from 5 to 150 PSI, store this little gauge on your keychain and maintain proper tire pressure at any time! Features & Specs 5-150 psiCompact keychain designDigital LED face readerMeasures in PSI, kPa and barTire sensor safePart #20112 Save Gas You can improve your gas mileage by around 3.3% by keeping your tires inflated to the proper pressure. Under-inflated tires can lower gas mileage by 0.4% for every 1 PSI drop in pressure of all four tires. Properly inflated tires are safer and last longer. Instruction Manual Mini Digital Tire Gauge Instruction Manual Safety Data Sheet SlimeButton Cell Battery SDS.