• Compatible with direct and indirect petrol engines that use 10, 12, 14 and 18mm spark plug threads
• Acurately detects common engine faults such as worn piston rings, worn valves, cracked cylinder heads and blown head gaskets
• Twin gauges indicate both cylinder pressure 0-100psi/0-7bar and percentage of cylinder leakage
• Both gauges are fitted with heavy duty rubber protectors
• Supplied in a plastic storage case
• Active