Sensor apparatus for capturing at least one flow property of a fluid medium, comprising - a plug-in sensor which can be introduced into the fluid medium and has a sensor housing which is designed to project into the fluid medium and has a head side projecting furthest into the fluid medium, an end face which points in the opposite direction to the fluid medium, a rear side facing away from the fluid medium and two sides in the form of a first side and a second side which are arranged opposite one another parallel to the direction of flow, wherein a channel region having at least one channel, through which the fluid medium can flow, is accommodated inside the sensor housing, and a channel inlet opening, via which the fluid medium can flow in, is provided on the end face of the sensor housing, - an electronics compartment which comprises at least one depression in the sensor housing which is accessible from a surface of the sensor housing, wherein the electronics compartment is closed on the first side using an electronics compartment cover, - an electronics module comprising a sensor carrier which carries a flow sensor, wherein the electronics module is at least partially accommodated in the electronics compartment, and the sensor carrier projects from the electronics compartment into the channel through which the fluid medium can flow, characterized in that - at least one pressure sensor and at least one moisture sensor are also accommodated inside the sensor housing, - the sensor housing comprises at least one sensor compartment formed separately from the electronics compartment, and the pressure sensor and preferably also the moisture sensor are at least partially accommodated in the sensor compartment, - the electronics compartment and the sensor compartment are designed in such a manner that they are accessible from mutually opposite sides (124, 126) of the sensor housing. - a plug-in sensor which can be introduced into the fluid medium and has a sensor housing which is designed to project into the fluid medium and has a head side projecting furthest into the fluid medium, an end face which points in the opposite direction to the fluid medium, a rear side facing away from the fluid medium and two sides in the form of a first side and a second side which are arranged opposite one another parallel to the direction of flow, wherein a channel region having at least one channel, through which the fluid medium can flow, is accommodated inside the sensor housing, and a channel inlet opening, via which the fluid medium can flow in, is provided on the end face of the sensor housing, - an electronics compartment which comprises at least one depression in the sensor housing which is accessible from a surface of the sensor housing, wherein the electronics compartment is closed on the first side using an electronics compartment cover, - an electronics module comprising a sensor carrier which carries a flow sensor, wherein the electronics module is at least partially accommodated in the electronics compartment, and the sensor carrier projects from the electronics compartment into the channel through which the fluid medium can flow, characterized in that - at least one pressure sensor and at least one moisture sensor are also accommodated inside the sensor housing, - the sensor housing comprises at least one sensor compartment formed separately from the electronics compartment, and the pressure sensor and preferably also the moisture sensor are at least partially accommodated in the sensor compartment, - the electronics compartment and the sensor compartment are designed in such a manner that they are accessible from mutually opposite sides (124, 126) of the sensor housing.