Abstract The working mechanism of resonant sensors is based on tracking the frequency shift in the linear vibration range. Contrary to the conventional paradigm. in this paper. we show that by tracking the dramatic frequency shift of the saddle-node bifurcation on the nonlinear parametric isolated branches in response to external forces. https://www.nacrack.com/flash-pick-7-5ft-Heavy-Duty-Gold-Metal-Round-Wedding-Arch-Photo-Backdrop-Stand-top-grab/