This guide outlines the process of becoming a CARB Certified Tester under the Clean Truck Check Act, which mandates emissions inspections for heavy-duty vehicles in California. It details the requirements for certification, including the completion of a training course designed to educate technicians on the regulatory requirements and testing processes for heavy-duty compliance tests. The training course has no associated fees and is accessible via CARB's website. Testers must achieve a minimum score of 80 percent on a 20-question multiple-choice exam to pass. After certification, testers receive a Tester ID Identification Number, valid for two years, after which they must retake the test to maintain their active status. The guide also explains the tools required for testing, such as CARB-approved applications, and the various employment opportunities available for certified testers in the industry.