Monkey Grip 17140-MG SmartTip Digital Tire Pressure Gauge's round SmartTip is designed to engage inside the tire valve for a more secure, air-tight connection and accurate pressure reading. With a pressure range of 0-150 PSI, this tire gauge has a lighted gauge display and a LED work light for nighttime use. This gauge also includes a built-in tread gauge for measuring tire tread depth and a bleeder valve. This unit uses (1) CR2032, 3-volt battery (included).