This tester can check the real pressure in the high pressure circuit in common rail system using a high pressure gauge(2000 bar) and high pressure flexible hoses. Diagnoses common rail system faults including the high-pressure circuit. its a must for every diesel specialist & mechanic. Tests both the high-pressure diesel pump & running pressure system when in use & cranking. Stainless Steel, Oil Filled, 2000bar mechanical analogue gauge. Can be connected in series between the high-pressure pump & the fuel rail or between the fuel rail & injectors.