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Cantilever sensors consisting of only a piezoelectric layer express both bending and torsional modes near ∼25 kHz that persist with reasonable Q-values (∼15) in liquids of high viscosity (>100 cP). Responses of both bending and torsional modes in liquids (1-1019 cP) were measured simultaneously. The bending mode response was more sensitive to mass-change effects than the torsional mode, and the response in liquids <70 cP matched theoretical values within 0.9%. At 1019 cP the bending mode response was within 10.4% of theory. The bending and torsional modes in PEMC can potentially be used simultaneously for bio-chemical sensing in very viscous samples.