The ADXL335 is a small, thin, low power, complete 3-axis accelerometer with signal Conditioned voltage outputs. The product measures acceleration with a minimum full-scale range of ±3 g. There are many more available, which have better sensitivity, such as ADXL326 which has a sensitivity of ±16g, etc. It can measure the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration.