Our Gauge Features1.Reliable Mechianical Bicycle Tire Pressure Gauge for Presta Valve - Bourden tube mechanism, no batteries required, keep high accuracy and good performance for years; 2.Legible 2.0",dail gauge with the special chuck for Presta Valves-Easy to read , and operate; 3.Pressure range to 160psi/11barDual scale with English and Metric, easy to ready for different people; 4.Excellent integrated air valve botton-Durable,for tire deflation adjustments or reset the dial; 5. Comfortable size fits h andbag pack or seat pack-Easy to carry; 6.Accuracy:100% inspection according to ANSI Grade B40.1 Grade B (middle 2%); 7.Suitable for Presta Valve only.How to Use 1.Use the pressure recommended by your vehicle's manufacturer, pls do not exceed the "max pressure" figure found on the tire sidewall. 2.Check pressure when tires are cold and have sat for at least one hour.3.Removing cap from inflation valve,place the gauge chuck firmly onto tire valve stem and press down evenly. If air escapes, apply more pressure until air stops escaping. 4.Remove gauge from valve stem to read tire pressure. 5.If tire pressure is too high, refit the tire pressure gauge to valve stem then gently press pressure release button until recommended pressure is reached. 6.If tire pressure is low, inflate to the recommended pressure then recheck. 7.Store tire pressure gauge in a safe, dust free area. Get One For You or Your Friend as Gifts!