This Expert DCT5 12 Piece Diesel Engine Compression Test Kit allows the compression of car & van diesel engines to be tested by cranking. Large easy-to-read scale measuring 0-1000psi/0-70kg/cm-square with 600mm of flexible hose & push on adaptor incorporating a Schrader one way valve. This Draper Compression Test Kit features a side pressure relief valve which allows rapid retesting.