In order to check the condition of your engine you cannot do without this 20 piece compression tester. The gauge has a range of 0-70 Bar / 0-1000 Psi. The compression tester comes with 4 different glow plugs and 3 injector adaptors. It also features a built-in resetter and all adapters have a shortcut. An elbow makes it possible to work in more difficult angles.