Fluxgate Magnetometer FGM-301

The same high precision magnetometer that is an exceptional magnetic heading reference sensor for our AHRS units is also available as a stand-alone analog magnetic sensor. Its high accuracy makes the Watson FGM an ideal choice for inertial navigation, geological mapping, and heading reference.


  • High Accuracy
  • High Resolution
  • High Reliability
  • Low Noise
  • Low Power
  • Small Size and Weight
  • Two Year Warranty
  • Engineering Support

Request For Quote



The FGM-301 is the best product for measuring DC and low frequency magnetic fields in three dimensions. This is a compact magnetic sensing device suitable for a wide variety of magnetic field measurement applications. Being an analog sensor, the FGM-301 provides high resolution and low signal delay. This product is far more stable and linear than magneto-resistive and magneto-inductive magnetometers.

Watson Industries has been developing state-of-the-art fluxgate magnetometers for almost thirty years to provide the FGM-301. As a result, this magnetometer is relied on for precision measurements in very critical projects around the world, including near the north and south poles.



Range: X, Y, Z ±700 mGauss ±70,000 nTesla
Analog Scale Factor: ±200 mGauss/V ±3.5V Output
Scale Factor Accuracy: 2%
Scale Factor Matching Between Axes: < 0.2%
Scale Factor Temp Coefficient: ±100 ppm per °C Typical
Bias: < 5 mGauss
Non-Linearity: < 0.01%
Bandwidth: 30 Hz
Noise: < 0.3 mGauss rms (Typical) <10 uGauss in 1 Hz bandwidth
Output Ripple: < 0.2 mGauss P-P


Temperature: Operating -50°C to 85°C
Temperature: Storage -50°C to 85°C
Vibration: Operating 3g rms 100 Hz to 1 KHz
Vibration: Survival 4g rms 100 Hz to 1 KHz
Shock: Survival 200g 10mS ½ sine wave


Input Power: 6 to 16VDC < 1W
Input Current: 55mA
Analog Output: ±3.5VDC
Analog Output Impedance: 1000 Ohm


Axis Alignment: < 0.3°
Size: Including Mounting Flanges 1.0W x 4.18″L x1.0″H 2.5 x 10.6 x 2.5 (cm)
Weight: 3.1 oz 88 grams
Connection: 9 pin male “D” subminiature
Life: > 50,000 Hrs MTBF
Specifications are subject to change without notice.
This product may be subject to export restrictions. Export Classification ECCN EAR99.



Title File Type
FGM-301 Spec Sheet pdf Download
FGM-301 Owner’s Manual pdf Download