Codetech Code Reader Read and Clear Engine Codes Monitor I/M Readiness Status View Freeze Frame Data Graph Live Data Manufacturer specific DTC Definitions built in , The Codetech builds upon the success of previous Launch Code Readers and adds a larger, high resolution backlit LCD screen. Not only can you read and clear codes, view readiness monitors and freeze frame data, you can graph live data as well. Lightweight and portable with a high resolution LCD display.