The Maddox Diesel Compression Test Kit is a brand new, never used tool specifically designed for testing heavy-duty and commercial diesel engines. With a maximum pressure of 1000 PSI and a pressure release button for safety, this kit includes a carrying case for easy portability and storage. Perfect for troubleshooting and maintenance tasks, this compression tester from Maddox is a reliable and essential tool for any diesel engine mechanic or auto enthusiast.