The Sears Flexible Drive Engine Compression Tester 28 2171 is a high-quality diagnostic tool made in the USA. This compression tester includes a 14mm adapter and features a pressure release button for easy operation. With a maximum PSI of 300, this unit is designed to provide accurate and reliable measurements for automotive engine testing. The product does not come with a warranty, but it is a durable and dependable tool for professional mechanics and auto enthusiasts looking to diagnose engine issues.