LEGO

Multi-Sensitivity Acceleration Sensor (ACCL-Nx-v3) is a 3 axis digital acceleration sensor designed for Lego mindstorms NXT. This sensor works at 4 different sensitivity levels of gravitiy.
The sensitivity can be chosen in your program.
This sensor can be used to measure static and dynamic acceleration in different axes. You can use this on your robot as tilt sensor or to track the velocity profile.