-The GY-271 is meant to have an HMC5883L, but some forums have a QMC5883L which has the equal simple capability, however isn't always compatible with the H. -The GY-271 QMC5883L th..
-The GY-273 module is primarily based at the Honeywell HMC5883L IC for low-subject magnetic sensing with a digital interface for applications which includes low cost compassing and..
-HW-127 HMC5883L 3-axis Electronic Compass Module Magnetic Field Sensor(with Original HMC5883L Driver Chip) is designed for low field magnetic sensing with a digital interface and ..