Magnetometer
LSM303 Triple-Axis Accelerometer/Magnetometer Module
LSM303 Module is a triple-axis accelerometer and magnetometer module integrated with LSM303 IC from STMicroelectronics.
HMC5883L Magnetometer Module
The HMC5883L is a triple-axis magnetometer compass, which uses I2C for communication. This Module consists of an on-board voltage regulator allowing you to power the module with voltages between 3.3V and 6V.