The Vintage Snap-On Tools Compression Gauge Test Kit MT308KB is a high-quality diagnostic tool designed for gasoline engines in passenger vehicles. Made in the United States with a maximum pressure of 300 PSI, this compression tester includes an adaptor hose and a pressure release button for ease of use. With no warranty but a proven track record of reliability, this kit is a must-have for automotive enthusiasts and professionals looking to accurately test compression levels in their vehicles. Guy said he never used it. Could be lie.