Analyte measurement kit , the analyte measurement kit including: a) a sensor assembly , the sensor assembly including a transcutaneous sensor element and a control unit ; the control unit including a battery for powering the sensor assembly and a magnetic sensor designed to generate an electrical activation signal in dependence of a magnetic field, wherein the control unit is designed to switch from a pre-operative state into an operative state upon generation of the activation signal; b) an insertion device , wherein the insertion device and the sensor assembly comprise complementary coupling structures for releasable coupling; wherein the insertion device is designed for executing an insertion routine, the insertion routine including advancing the sensor assembly from a retracted position where the transcutaneous sensor element stands back behind a skin contact surface of the insertion device into an advanced position where the sensor element projects beyond the skin contact surface , and subsequently decoupling the insertion device from the sensor assembly , and executing the insertion routine is associated with a change of a magnetic coupling between an activation magnet and the magnetic sensor 122 of the sensor assembly , thereby generating the activation signal, the analyte measurement kit being characterised in that the insertion device includes the activation magnet . a) a sensor assembly , the sensor assembly including a transcutaneous sensor element and a control unit ; the control unit including a battery for powering the sensor assembly and a magnetic sensor designed to generate an electrical activation signal in dependence of a magnetic field, wherein the control unit is designed to switch from a pre-operative state into an operative state upon generation of the activation signal; b) an insertion device , wherein the insertion device and the sensor assembly comprise complementary coupling structures for releasable coupling; wherein the insertion device is designed for executing an insertion routine, the insertion routine including advancing the sensor assembly from a retracted position where the transcutaneous sensor element stands back behind a skin contact surface of the insertion device into an advanced position where the sensor element projects beyond the skin contact surface , and subsequently decoupling the insertion device from the sensor assembly , and executing the insertion routine is associated with a change of a magnetic coupling between an activation magnet and the magnetic sensor 122 of the sensor assembly , thereby generating the activation signal, the analyte measurement kit being characterised in that the insertion device includes the activation magnet . wherein the insertion device is designed for executing an insertion routine, the insertion routine including advancing the sensor assembly from a retracted position where the transcutaneous sensor element stands back behind a skin contact surface of the insertion device into an advanced position where the sensor element projects beyond the skin contact surface , and subsequently decoupling the insertion device from the sensor assembly , and executing the insertion routine is associated with a change of a magnetic coupling between an activation magnet and the magnetic sensor 122 of the sensor assembly , thereby generating the activation signal, the analyte measurement kit being characterised in that the insertion device includes the activation magnet . <EOS>