A measuring system for registering a measured variable of a flowing medium. A measuring transducer, a sensor arrangement, measuring electronics, a measuring tube and a flow conditioner are included. The sensor arrangement has at least one sensor element which delivers at least one measurement signal. The measuring electronics communicates with the measuring transducer and using the at least one measurement signal produces at least one measured value representing the measured variable. The flow conditioner has lumen tapering in the direction of the measuring tube. During operation, medium flows through the lumen and against an impingement surface of the flow conditioner.