Provides critical information about an engines compression Simplifies carrying out leak down tests which can be more accurate than standard compression tests Used to identify and detect a number of engine faults including: worn piston rings, worn valves, cracks in cylinder walls and blown head gaskets Gauges show percentage of cylinder leakage and cylinder pressure Suitable for use on any petrol engine with either a 14mm or 18mm spark plug Set contains pressure gauge, cylinder leakage gauge, 14mm and 18mm spark plug adaptors, quick connect/disconnect hose, air regulator User guide included