nozzle 1 is mounted within a fuel injector body not shown in fig4 and extends into a main chamber 25 fuel is supplied to the nozzle 1 via an inlet drilling 5 in the nozzle 1 an electronic control valve not shown in fig4 is provided for controlling fuel flow to the nozzle 1 a plurality of spray hole outlets are defined in the nozzle 1 of which a first spray hole outlet 27 a and a second spray hole outlet 27 b are indicated in fig4 the nozzle 1 comprises a nozzle needle 2 which is moveable relative to a needle seat 3 for controlling fuel flow through the spray hole outlets 27 a 27 b the spray hole outlets 27 a 27 b are closed by the nozzle needle 2 when the nozzle needle 2 is seated such that fuel flow through the spray hole outlets 27 a 27 b is prevented an injection event is commenced when the nozzle needle 2 is lifted away from the seat 3 to open the spray hole outlets 27 a 27 b and thereby enable fuel to flow out of the spray hole outlets 27 a 27 b as shown in fig4 a micrometer 4 for precisely controlling the lift of the nozzle needle 2 relative to the seat 3 is positioned.