SG34000 Features: -Universal compression tester. -Quick side release valve permits retest without removal of adapters. -Screw-in adapters guarantee accuracy over push-in type testers. -Used to test compression on all domestic and foreign cars and most trucks. Specifications: -5/8" Hex plugs. -Adapters fit plugs 14mm and 18mm. -Gage ranges 0-300 PSI and 0-21 BAR.