STEELMAN 97977 High Accuracy Digital Tire Inflator 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 This unit exceeds the requirements of California AB32, with an error rating of 0.25 PSI Includes a certificate of conformance that may be retained by the purchaser to demonstrate and assure compliance to the law