LONGACRE DELUXE TIRE DUROMETER WITH STORAGE CASE LONGACRE DELUXE TIRE DUROMETER WITH STORAGE CASE LONGACRE Racing Tire Hardness Tester Tire hardness has a huge affect on your car's performance. A tire too hard won't bite and a tire too soft may wear quickly or even ball up. Also tire hardness changes during its life cycle. To run your best you must keep track of all your tire's hardnesses. This easy-to-use tool will help you do just that - quickly, accurately & easily. Reads from 0-100 points (Shore 'A' scale)Straight edge on base to 'rock' durometer for more consistent resultsNon-slip coating for better gripCalibration test block includedDial can be 'Zeroed'Comes with hard case and pouchFor the most consistent results rock the durometer from angled back past straight up to angled forward. The pointer will move up to the highest (true) reading, then back down. Record the highest reading reached.