The BlueSpot 4 PCE Petrol Engine Compression Testing Set is manufactured with a cone adapter which is suitable for most petrol engine types. The set also includes 14mm and 18mm screw-in adapters for use with spark plugs. The dial has a dual scale (PSI and Bar), a large 65mm face for easy reading and will read up to 300 PSI (20 Bar). The push-fit couplings ensure easy and quick removal of fittings and a quick release pressure valve is situated below the dial for increased safety. Set supplied in a robust plastic carry case for ease of storage and transportation.