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 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 of the sensor housing . <EOS>