This system provides the doctor with precise data on the patient’s depth of anaesthesia. The measuring device may be comfortably held in one hand. To ensure optimal cable routing, the charging and communication connectors are at the top of the housing, while the sensor connector is at the bottom. The disposable sensor is very flexible and robust at the same time. Especially practical is the self-adhesive surface. The holder of the measuring device can be mounted to a bar at the touch of a button with just one hand.