Vacuum testing applications include: automatic transmission, vacuum reservoirs, air conditioning and heating, heater cones, brake systems including ABS and conventional, engine management systems, emission control systems, fuel systems, engine tuning, ignition systems, engine management including cylinder heads, valve stem oil seals, piston ring retainers on diesel engines, waste gases on turbo chargers Dual function - vacuum: 0 - 30 in vacuum (0 to -1 bar) Pressure: 0 - 60psi (0 - 4 bar) Simply select the air intake control valve on the pump: Out for pressurised systems, In for testing vacuums