The Snap On MT380L Compression Gauge Set is a high-quality diagnostic tool designed specifically for gasoline engines in passenger vehicles. With a maximum PSI of 300, this compression tester features a convenient pressure release button for easy use. The Snap On brand ensures reliability and durability, making it a valuable addition to any automotive tool collection. Although it does not come with a warranty, this set is brand new and unused, guaranteeing a top-notch performance for your vehicle testing needs.