Systems, devices, and methods for a dual-sensor apparatus (101), comprising: a conductive substrate (124); a piezoelectric material (126) disposed on the conductive substrate (124); and an electrically conductive trace (102) disposed on the piezoelectric material (126) in a strain gauge pattern, where the electrically conductive trace (102) comprises two leads; where the conductive substrate (124) and the electrically conductive trace (102) serve as electrodes for the piezoelectric material (126) to form a piezoelectric sensor; and where the electrically conductive trace (102) serves as a strain sensor.