A measurement circuit for measuring a property in a body comprises: a resonant circuit comprising a first element and a second element, wherein at least one of the first element and the second element is configured such that a property thereof is dependent on the property in the body and a non-linear element arranged to generate intermodulation products when the circuit is driven by an input signal comprising a first component at a first frequency and a second component at a second frequency. A measurement system for measuring a property in a body comprises: a measurement circuit as described above a driving circuit for providing a driving signal to the measurement circuit, wherein the driving signal comprises a first component at a first frequency and a second component at a second frequency and an analyzer circuit for analyzing a response of the measurement circuit in order to obtain a measurement of the property.
