The Snap-On Tools MT308L Compression Gauge Set is a high-quality diagnostic tool designed for automotive use. With a maximum PSI of 250, this set includes 10mm hoses and a convenient black case for storage. Made in the United States, this compression tester is perfect for troubleshooting engine issues, particularly in gasoline engines. The pressure release button adds functionality to this essential tool for mechanics and car enthusiasts looking to accurately measure compression levels.