Go Direct® 3-Axis Magnetic Field Sensor (GDX-3MG)
Specifications and User Guide

– Primary Test: Press the power button on the sensor to turn it on. (The red LED will flash.) Start the Graphical Analysis app on your device and select the sensor from the list of available sensors. (The green LED will flash to indicate the sensor is connected.) Move the sensor near a permanent magnet and check for the magnetic field readings to change.

When I hold the tip of the Go Direct 3-Axis Magnetic Field sensor next to the pole of a magnet, the sensor reads zero
Is the Go Direct 3-axis Magnetic Field Sensor submersible?
How do you calibrate the GDX-3MG sensor?
How can I more precisely measure a magnetic field using a Vernier magnetic field sensor?

-Magnetic field range: ± 5 mT (high precision) and ± 130 mT (low precision)
-Resolution: 0.0002 mT (high precision) and 0.1 mT (low precision)
-Maximum wireless range: 30 m, unobstructed

Sensor Dimensions
-Overall length (handle + shaft): 19.5 cm
-Shaft: length 12.2 cm, cross section is square with slight taper. Maximum cross section is square, 9 mm x 9 mm closest to the handle.
-Handle dimensions: length 7.3 cm, maximum width 3.3 cm

Go Direct 3-Axis Magnetic Field uses Bluetooth low energy technology and can only be used wirelessly with devices that support Bluetooth low energy technology running the appropriate software. Otherwise, connect the sensor to your device using the included USB cable.

This sensor requires Graphical Analysis 4 software on iOS, Android, Chrome, Windows, or macOS.

-Calibrate? No. The sensor is set to the stored calibration before shipping.
-It is not practical to calibrate the Magnetic Field Sensor without reference to a known source of magnetic field. It is useful, however, to zero the Magnetic Field Sensor. Position the sensor, and zero it using the data-collection software. Then, move the magnetic field source (but not the sensor) to explore the spatial variations of the field.

If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging or has reached its end of life and can no longer hold a charge. First, try charging the sensor for several hours. If the sensor still won’t turn on when disconnected from USB, the battery has likely reached its end of life. If you intend to use this sensor wirelessly, the battery will need to be replaced. The rechargeable battery in this sensor is covered by a one year warranty but should last two to five years in typical use.
How do I replace the battery in a Go Direct Wand-Type Sensor?

– (GW-BAT-300, discontinued)
Micro USB Cable (CB-USB-MICRO)
Micro USB to USB-C Cable (CB-USB-C-MICRO)

Magnetic Field Sensor (MG-BTA)
–Go Wireless® Charging Station (GW-CRG, discontinued)