A magnetic field probe, particularly for magnetic resonance applications, comprises: - a detector liquid that exhibits a nuclear magnetic resonance (NMR) line character- ized by a chemical shift δ; - an electrically conductive structure surrounding the detector liquid for receiving therefrom a magnetic resonance signal; and - a container containing the detector liquid; - the detector liquid containing paramagnetic dopant means dissolved therein; - said NMR transition having an observable resonance frequency ω when the field probe is placed in an external magnetic field; and has orientation means for orienting the field probe in relation to a reference direction of said external magnetic field. The concentration c D of said paramagnetic dopant means is selected in such manner that, when the field probe is placed into an external magnetic field B 0 and oriented in a predefined manner with respect to said external magnetic field at a given temperature T 0 , a temperature dependence ω'(T 0 ) of said resonance frequency is substantially zero.