The german word for _pre-measure_ is _Prämaß_ , sweet and simple, and _pre-measures_ is _Prämaße_.
_Maß_ simply means _measure_ , and _prä_ is the german version of the english _pre_.
_Maßnahme_ is only then a correct translation of _measure_ if _measure_ is used as a synonym for _action_. So for example "Measures haven been taken" translates to "Maßnahmen wurden ergriffen", and _counter-measure_ translates to _Gegenmaßnahme_.