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Earlier work [C. A. Grimes etal, Smart Mater. Struct. 8, 639, (1999)] has shown that upon immersion in liquid the resonant frequency of a magnetoelastic sensor shifts linearly in response to the square root of the liquid density and viscosity product. It is shown that comparison between a pair of magnetoelastic sensors with different degrees of surface roughness can be used to simultaneously determine the liquid density and viscosity. © 2000 American Institute of Physics.