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 (130, 230) 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 (130, 230) 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.