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Features: Pressure gauge with a range of 300 psi (21 bar) Two conical rubber tips that seal the spark plug socket, and a tip screwed into the spark plug socket (M14 and M18) Packed in a handy suitcase Technical Data: Application: for measuring compression pressure|for spark ignition|for all types of engines Measuring range: 0-2.1MPa Gauge diameter: 75mm Connector type: rubber|conical|threaded Adapter size: M14|M18