The Accutire Tread Depth Dial Tire Gauge measures both the depth of your tread and the inflation of your tires. These two essential measurments are vital to keeping you safe. This is an easy-to-use instrument that is very accurate. The large dial is surrounded by rubber to keep this tool measuring accurately for years to come. Enjoy peace-of-mind with the Accutire Tread Depth Dial Tire Gauge.