Sealey ct951 petrol engine compression tester sealey ct951 fitted with 65mm gauge having two scales psi and kpa reading from 0 300psi and 0 2000kpa includes quick coupling 150mm rigid stem with cone type adaptor and 320mm flexible adaptor with 14 and 18mm screw in adaptors supplied in blow moulded case with instructions sealey ct951 petrol engine compression tester