Product Details: The Hendrickson Pro Controller Test Gauge is designed to help diagnose and troubleshoot the pro controller system. This gauge provides accurate pressure readings to ensure reliable diagnostic results. It is easy to use and features a large, easy-to-read display for quick and accurate readings. The gauge is also designed to be durable and long-lasting, making it a great choice for any professional mechanic. With its precision accuracy and reliable performance, it is the perfect tool for any pro controller system. FleetPride is your First Click in Heavy Duty®.