Description:* Holds Pressure Reading - Need To Stay In Place Until Released* Built-In Purge Button - For Easy Deflation Adjustment< /P>*Bourdon Tube - Precision Movement Is Unaffected By Temperature, Humidity Or Altitude*No Batteries Required - Mechanical Gauge Operates Reliably And Accurate Without Batteries* 360 Degree Swivel Chuck - Pressure Can Be Read Easily At Any Angle* Built To Last - Heavy Duty Steel And Brass Construction< P>* Gear Style Rubber Cover Boot - Protects Your Gauge From Drops And Knocks* Mechanic RecommendedWhy Maintaining Proper Tire Pressure Is Essential:* Longer Lasting Tires By Promoting Proper And Even Tire Tread Wear Patterns* Improved Fuel Economy, Which Means Less Time And Money Spent On Fuel Pump* Performance And Smoother Vehicle Handling For An Overall More Enjoyable Driving Experience* Increased Driving Safety By Reducing The Risk Of Tire Failure Due To Under-InflationSave In Safety SafetySave Money On Gas: Maintaining The Correct Tire Pressure Maximizes Your Vehicle'S Fuel Efficiency, Saving You Money At The Pump< P>Save Money On Tires: Preventing Over/Under Inflation Dramatically Reduces Tire WearKeep You And Your Family Safe: Test Tire Pressure Before Driving, It Can Ensure You Driving Safely All The WayPackage Includes:1 X Tire Pressure Gauge (100Psi)