Modular measuring apparatus for outputting a measuring signal which represents the difference between a first pressure of a medium at a first location and a second pressure of a medium at a second location, comprising: a first pressure transducer module designed to record the first pressure and to generate and output a series of first signals, each representing a current value of the first pressure; a second pressure transducer module designed to record the second pressure and to generate a series of second signals, each representing a current value of the second pressure; an evaluation module designed to determine a series of difference values between the first pressure and the second pressure and to output a series of fourth signals, each representing a difference between the first pressure and the second pressure; a first cable connection between the first pressure transducer module and the second pressure transducer module; and a second cable connection between the second pressure transducer module and the evaluation module, wherein the first pressure transducer module is physically separated from the second pressure transducer module, and wherein the evaluation module is physically separated from the two pressure transducer modules; wherein the second pressure transducer module has a mapping unit, which is designed to receive the series of first signals and the series of second signals and to generate a series of third signals which each contain information about the first pressure and information about the second pressure based on at least a first signal and at least a second signal, and to transmit the series of third signals to the evaluation module via the second cable connection. a first pressure transducer module designed to record the first pressure and to generate and output a series of first signals, each representing a current value of the first pressure; a second pressure transducer module designed to record the second pressure and to generate a series of second signals, each representing a current value of the second pressure; an evaluation module designed to determine a series of difference values between the first pressure and the second pressure and to output a series of fourth signals, each representing a difference between the first pressure and the second pressure; a first cable connection between the first pressure transducer module and the second pressure transducer module; and a second cable connection between the second pressure transducer module and the evaluation module, wherein the first pressure transducer module is physically separated from the second pressure transducer module, and wherein the evaluation module is physically separated from the two pressure transducer modules; wherein the second pressure transducer module has a mapping unit, which is designed to receive the series of first signals and the series of second signals and to generate a series of third signals which each contain information about the first pressure and information about the second pressure based on at least a first signal and at least a second signal, and to transmit the series of third signals to the evaluation module via the second cable connection.