The Vintage SunTune 0 – 21 KG Per Sq Cm / 0 – 300 PSI Compression Tester is a diagnostic service tool designed for automotive use. With a maximum pressure of 300 PSI, this compression tester allows for accurate readings of engine performance and cylinder health. Made by the brand SunTune, this vintage tool is ideal for mechanics and car enthusiasts looking to diagnose any issues with engine compression.