The Performance Tool FLEX DRIVE COMPRESSION TESTER is a reliable automotive hand tool designed to check the compression of engines. With a range of 0-300 PSI, this compression tester by Performance Tool is able to accurately measure the engine’s performance. The Flex Drive feature ensures a smooth and precise operation, making it a valuable tool for mechanics and car enthusiasts looking to diagnose any issues with engine compression. The durable construction and easy to use design make it a practical addition to any toolbox.