Diesel tester for measurement and control of the return flow of injector valves of "common rail" type, with the aid of an external flow meter. Can monitor 6 injector valves simultaneously. Quickly and accurately measures the amount of fuel returned by each valve to the return container. The set contains four different models of injector adapters (6 per model), which fit injector valves from the brands BOSCH, SIEMENS, DENSO and DELPH.