The LSM303DLH is a triple axis accelerometer combined with a triple axis magnetic sensor. This breakout board uses the LSM303DLH to give a you the data you need to feed into a microcontroller and calculate tilt-compensated output. Project description, more information and ordering can be found at https://www.sparkfun.com/products/9810 Datasheet: http://www.sparkfun.com/datasheets/Sensors/Magneto/LSM303%20Datasheet.pdf Application Notes: http://www.sparkfun.com/datasheets/Sensors/Magneto/Tilt%20Compensated%20Compass.pdf