Designed to detect a variety of common engine faults including; worn piston rings, worn valves, cylinder head cracks and blown head gaskets. Twin gauge manifold shows percentage of cylinder leakage and cylinder pressure. Supplied in storage case with instructions. For spark plugs fitted into a deep recess, VS200/A, Long Reach Compression Tester Adaptor may be required. Features & Benefits:Designed to detect a variety of common engine faults including: worn piston rings, worn valves, cylinder head cracks and blown head gaskets.Twin gauge manifold shows percentage of cylinder leakage and cylinder pressure.Suitable for use with any petrol vehicle with 10, 12 or 14mm spark plugs.Supplied in storage case with instructions.For spark plugs fitted into a deep recess, VS200/A - Long Reach Compression Tester Adaptor may be required.Model No. VSE2020 Specifications: Model No VSE2020 Application(s): Spark Plugs; 10, 12, 14mm Brand: Sealey Contents: Gauges (x2) Nett Weight: 1.78