A flux probe (100) for measuring the rotor flux of an electric generator (10). The probe (100) is affixed to a probe carrier (102) and held within a stator coil slot (62) by affixing the carrier (102) to two opposing grooves (104) formed in sidewalls (81) of the slot (62). One or more stator coils (18) are also disposed in the slot (62) and retained therein by a wedge (74) and corresponding spring (72) that applies an radially outwardly directed force to the coils (18). In one embodiment the probe carrier (102) is affixed to a radially inwardly directed face (82) of the wedge (74).