Model 411 accelerometer is based on a latest piezoresistive MEMS sensing element which offers exceptional dynamic range and stability. This piezoresistive accelerometers are rugged undamped units designed for shock measurements. The etched silicon chip includes the inertial mass and strain gages arranged in an active four-arm Wheatstone bridge circuit. The low mass, extremely small size and unique construction of the element provide high resonance frequency with characteristics such as low impedance, high overrange, and zero damping for no phase shift. The high resonance frequency of these sensors permits their survival in the presence of high frequency signal after shock pulse that could shatter the seismic system of accelerometers having lower resonance. High resonance frequencies and zero damping also allow the accelerometer to respond accurately to fast rise time, short duration shock motion. With a frequency response extending down to static or steady state accelerations, these transducers are ideal for measurements of long duration transients. Model 411 adopts a strong and reliable structure, which greatly reduces the damage probability of cable joints in wiring and shock.