The Models 3029 and 3033 piezoelectric accelerometers exhibit a nominal transfer sensitivity of 100 picoCoulombs/g and may be used without auxiliary signal conditioning to provide an economical and reliable means of vibration measurement. The internal construction of the piezoelectric seismic system ensures that the units have no discernible spurious response to mounting torque, body strains, cable vibration, cable whip, pressure variations and most heat transients.