3pc Petrol Engine Compression Test Kit Fitted with 65mm diameter gauge with 4 scales Psi | Bar | kg/cm | kPa readings - 0 - 300psi 0 - 21 bar 0-21 kg/cm 0 - 2100 kPa. Includes quick coupling 150mm rigid stem with cone-type adaptor and 320mm flexible adaptor with 14 and 18mm screw in adaptors. Supplied with instructions.