Method for verifying a clamp-on ultrasonic measuring device, where the measuring device comprises: at least two ultrasonic transducers for transmitting and receiving ultrasonic signals, an electronic measuring/operating circuit set up for operating the at least one ultrasonic transducer and for providing measured values of at least one measured variable and for carrying out the verification, wherein the electronic measuring/operating circuit has a memory unit, wherein the method comprises the following steps: Mounting the measuring device on a standard measuring section in a first process step, wherein the standard measuring range is one from the following list: measuring block, measuring rod; Switching on a verification mode of the electronic measuring/operating circuit in a second method step; Transmitting at least one ultrasonic signal with at least one ultrasonic transducer and receiving the ultrasonic signal with at least one ultrasonic transducer in a third method step; Determination of at least one measured value of at least one verification variable of the ultrasonic signal and comparison of the measured value with at least one specification value of the verification variable stored in the memory unit in a fourth method step; Outputting a verification result in a fifth method step; Ending the verification mode in a sixth process step. at least two ultrasonic transducers for transmitting and receiving ultrasonic signals, an electronic measuring/operating circuit set up for operating the at least one ultrasonic transducer and for providing measured values of at least one measured variable and for carrying out the verification, wherein the electronic measuring/operating circuit has a memory unit, wherein the method comprises the following steps: Mounting the measuring device on a standard measuring section in a first process step, wherein the standard measuring range is one from the following list: measuring block, measuring rod; Switching on a verification mode of the electronic measuring/operating circuit in a second method step; Transmitting at least one ultrasonic signal with at least one ultrasonic transducer and receiving the ultrasonic signal with at least one ultrasonic transducer in a third method step; Determination of at least one measured value of at least one verification variable of the ultrasonic signal and comparison of the measured value with at least one specification value of the verification variable stored in the memory unit in a fourth method step; Outputting a verification result in a fifth method step; Ending the verification mode in a sixth process step. Mounting the measuring device on a standard measuring section in a first process step, wherein the standard measuring range is one from the following list: measuring block, measuring rod; Switching on a verification mode of the electronic measuring/operating circuit in a second method step; Transmitting at least one ultrasonic signal with at least one ultrasonic transducer and receiving the ultrasonic signal with at least one ultrasonic transducer in a third method step; Determination of at least one measured value of at least one verification variable of the ultrasonic signal and comparison of the measured value with at least one specification value of the verification variable stored in the memory unit in a fourth method step; Outputting a verification result in a fifth method step; Ending the verification mode in a sixth process step. measuring block, measuring rod; Switching on a verification mode of the electronic measuring/operating circuit in a second method step; Transmitting at least one ultrasonic signal with at least one ultrasonic transducer and receiving the ultrasonic signal with at least one ultrasonic transducer in a third method step; Determination of at least one measured value of at least one verification variable of the ultrasonic signal and comparison of the measured value with at least one specification value of the verification variable stored in the memory unit in a fourth method step; Outputting a verification result in a fifth method step; Ending the verification mode in a sixth process step.