LONGACRE DIGITAL TIRE DUROMETER WITH STORAGE CASE LONGACRE DIGITAL 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. NEW Digital Readout 0-100 (Shore 'A' scale) Straight edge on base to 'rock' durometer for more consistent resultsNon-slip coating for better gripCalibration test block includedAccurate easy-to-useIncludes hard case and pouchReads in .5 incrementsFor the most consistent results rock the durometer from angled back past straight up to angled forward. The readout will move up to the highest (true) reading, then back down. Record the highest reading reached. The durometer must have a straight edge on base to do this properly. If you just push straight down you may get inconsistent and inaccurate results.