The Central Tools STORM 0 to 5.5" Electronic Digital Rotor Gage is a diagnostic and testing tool designed for measuring brake rotors. Made by Central Tools in the United States, this disc and drum gauge is semi-universal and suitable for a variety of vehicles. With its electronic digital display, this product provides accurate measurements of rotor thickness within the range of 0 to 5.5 inches. The interchangeable part number 3M430A and other part number 88925679 ensure compatibility with different brake service tools, making it a valuable addition to any automotive workshop.