Lang flex drive compression tester tests domestic and foreign cars and trucks with gasoline engines. Lang flex drive compression tester features a 14mm and 18mm adapter attached to end of 12” hose, and a separate 14mm long reach adapter that can be screwed onto end of hose adapter by hand. Lang flex drive compression tester also features a side release valve to allow multiple retesting without removing the tester. The Lang 2 1/4” gauge has dual scale dial with ranges from 0-300 PSI and 0-21 bar.