1.Highly Accurate Metal Mechanical Tire Gauge2.1BAR = 14.223PSI = 100KPA = 1.019 / CM23.Easy to use， with good durability and accurate readings4.The unique design of the tire pressure， easy to use， easy to carry， O-type return spring button design， click directly to zero[Note] 1. Measure the tire pressure in the tires cool down state. 2， the end of the tire pressure tire gauge door mouth pressed to know tire pressure gauge pointer moves to the highest position. 3， please keep the front tire gauge vertically and read the tire pressure. 4， check the tire pressure (pressure often carved in the side of the tire)， and maintain proper tire pressure. 5， in order to prevent the gauge internal parts elastic fatigue， press pressure relief valve， pressure gauge so that within the exclusion. 6. After the measurement， re tire valve cap lock lips. Pressure unit conversion table: 1BAR = 14.223PSI = 100KPA = 1.019 / CM2 This high-quality tire inflator with attached air pressure gauge is a must-have accessory for anyone who owns an air compressor. Simply attach this inflation device to your compressor hose and start filling up anything with a valve stem. T his air pressure gauge displays various pressure measurements in both standard and metric values. Ideal for use on cars， trucks， SUV's， trailers， ATV's， motorcycles， bicycles and most other valve stem inflatables.