The 9DOF Sensor board is a very small sensor board with 9 degrees of freedom. It includes the ADXL345 accelerometer, the HMC5883L magnetometer, and the ITG-3205 gyro. The board has a simple I2C interface and a mounting hole for attaching it to your project. Also, The small volume of the sensor board allows it to be easily mounted in just about any application. If you need a simple and tiny board that gives you 9 degrees of freedom, this would be a good choice