Amazon.com: TM 192 3-axis Magnetic Field Meter : Industrial & Scientific
LSM303DLHC e-Compass 3 axis Accelerometer and 3 axis Magnetometer Module NEW | eBay
DAOKI 3V-5V GY-273 QMC5883L Triple Axis Compass Magnetometer Sensor Module Three Axis Magnetic Field Module Materiale,for Arduino Three Axis Magnetic Field Module: Amazon.com: Industrial & Scientific