A monitoring unit for determining an attribute of a liquid substance, comprising measurement means configured to subject the liquid substance to an electromagnetic field (B(f)), under influence thereof measure at least one electromagnetic property of the liquid substance, and based on the measurement determine said attribute, the monitoring unit comprises: at least one dielectric conduit (110, 111, 112) configured to transport a flow of the liquid substance through the monitoring unit, a measuring circuitry including a coil member encircling the dielectric conduit, the measuring circuitry being configured to register an impedance measure (z(f)) of the liquid substance when flowing through the dielectric conduit, and a processor configured to derive said attribute based on the registered impedance measure (z(f)), wherein said attribute contains a first number of different parameters (p 1, p 2, p 3), the first number being larger than or equal to two, characterised in that the monitoring unit comprises: a second number of measuring circuitries, the second number being larger than or equal to the first number, each measuring circuitry including a coil member (121, 122, 123) en-circling one of the at least one dielectric conduit (110, 111, 112), and each measuring circuitry being configured to register a respective impedance measure (z(f 1), z(f 2), z(f 3)) of the liquid substance when flowing through said one of the at least one dielectric conduit (110, 111, 112) in response an electromagnetic field (B(f)) applied to the liquid substance via the at least one coil member (121, 122, 123), and the processor is configured to derive each of the first number of parameters (p 1, p 2, p 3) based on the registered impedance measures (z(f 1), z(f 2), z(f 3)). at least one dielectric conduit (110, 111, 112) configured to transport a flow of the liquid substance through the monitoring unit, a measuring circuitry including a coil member encircling the dielectric conduit, the measuring circuitry being configured to register an impedance measure (z(f)) of the liquid substance when flowing through the dielectric conduit, and a processor configured to derive said attribute based on the registered impedance measure (z(f)), wherein said attribute contains a first number of different parameters (p 1, p 2, p 3), the first number being larger than or equal to two, characterised in that the monitoring unit comprises: a second number of measuring circuitries, the second number being larger than or equal to the first number, each measuring circuitry including a coil member (121, 122, 123) en-circling one of the at least one dielectric conduit (110, 111, 112), and each measuring circuitry being configured to register a respective impedance measure (z(f 1), z(f 2), z(f 3)) of the liquid substance when flowing through said one of the at least one dielectric conduit (110, 111, 112) in response an electromagnetic field (B(f)) applied to the liquid substance via the at least one coil member (121, 122, 123), and the processor is configured to derive each of the first number of parameters (p 1, p 2, p 3) based on the registered impedance measures (z(f 1), z(f 2), z(f 3)). a second number of measuring circuitries, the second number being larger than or equal to the first number, each measuring circuitry including a coil member (121, 122, 123) en-circling one of the at least one dielectric conduit (110, 111, 112), and each measuring circuitry being configured to register a respective impedance measure (z(f 1), z(f 2), z(f 3)) of the liquid substance when flowing through said one of the at least one dielectric conduit (110, 111, 112) in response an electromagnetic field (B(f)) applied to the liquid substance via the at least one coil member (121, 122, 123), and the processor is configured to derive each of the first number of parameters (p 1, p 2, p 3) based on the registered impedance measures (z(f 1), z(f 2), z(f 3)).