Master Gas Diesel Direct and Indirect Engine Compression Pressure Tester Gauge Checks diesel and gas engine compression under cranking conditions Small profile, quick coupling adapters: for speed and security Flexible hose (355 mm) gives access to restricted plug and injector ports Dual scale 80 mm diameter Gauge 0 - 600 Lb/In and 0 - 40 bar DIESEL Direct and In-Direct Engine Compression Pressure Tester