The Lisle Compression Tester - 20250 is a must-have tool for any mechanic or DIY-er. This tester is designed to help you quickly and accurately diagnose low compression problems in engines. It features a quick-connect adapter that fits most spark plug holes, a flexible hose with a gauge, and a valve to release the pressure. It reads up to 300 psi and has a large, easy-to-read dial. This tester is durable and built to last, and it comes with a convenient carrying case. Get the Lisle Compression Tester - 20250 and make sure your engine is running at its best.