STEELMAN high accuracy pressure gauge provides confidence that your tires are inflated properly, increasing safety and fuel economy. Ranges from 0 - 100 PSI (+/- 0.25 percent PSI accuracy). Reads in PSI, Bar, kPa and kg/cm2. Features automatic temperature/pressure compensation and peak/valley/track pressure reading modes. 2.6" gauge with back-lit LCD, pressure relief valve, auto zero and auto off features included. Also, features low battery indicator and over-pressure indicator. Rubber boot provides added protection and includes 18" whip hose with swivel chuck. Unit runs on one 9 volt battery (included) and instructional key chain hangs from unit for easy access. This unit exceeds the requirements of California AB32, with an error rating of 0.25 PSI and includes a certificate of conformance that may be retained by the purchaser to demonstrate and assure compliance to the law.