Petrol compression meter with adaptors

Easy-to-read high-precision diagram.
Large-scale diagram card: 50 mm surface.
Possibility of recording 8 tests (+2 reserves) on the diagram card to compare the cylinders with each other.
Method for connecting up to the spark plug port by means of a very simple quick-connect coupling.
Compressionmeter-recorder for petrol engines.
Product supplied with 50 diagram cards, 5 rubber spare parts and 1 coupling for spark plug M12.