Lang engine oil pressure tester checks oil pressure in automatic transmissions and gasoline engines. The Lang automatic transmission and engine oil pressure tester tests most domestic and imported cars and light trucks, and is more accurate than dashboard oil pressure gauges. The Lang pressure tester is especially helpful on cars with dash indicator light only. The Lang tester includes a hook on gauge enables the Technician to hang up gauge and hose assembly to free his hands. The 2 1/2” gauge has a dual scale dial with ranges from 0-300 PSI and 0-21 bar.