This Item Is Perfect For Checking Compression On Petrol Engine Quickly And Accurately. Easy Pressure Release Button On Side Of Tester. It Diagnoses Problems Quickly With 2 Rubber Cones Ends Which Do Not Need To Thread Into Head. Completed Kit Comes With Adapters For Most Applications. Our Item Is Suitable For Petrol Engines On Lawn Mowers, Motorbikes, Cars, Trucks And So On. Kit includes: 2x rubber cones ends for quick check (no need to thread into head) 1x cylinder compression gauge 4x Fittings M10, M12, M14, M18 (Male, With "O" Ring) Includes 14mm and 18mm spark plug adapters 1x with 1/2" diameter x 14" extension hose