Apparatus for controlling a fuel injector (10) or fuel injection nozzle (10) of an internal combustion engine fuel injector (10) with a pump (12) which provides an injection pressure, with the help of which a fuel injector (10) can be fed into a tank (13) of a ready-to-hold control means (10). ) to be checked or to the fuel injection nozzle (10) to be checked, in which the fuel injector (10) to be checked or the fuel injection nozzle (10) to be controlled slides into a control chamber (11) or is located in the control chamber (11) and injects the control means in this control chamber (11), and in which the control chamber (11) is placed against a test strip (14),which draws on the fuel injector (10) to be controlled or by the fuel injection nozzle (10) to be controlled injected control means in the form of an injection pattern to be analyzed.
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