- Two cylindrical tubes are equal in length (12″), one is inside the other, both of them are closed at one end. At the other end, the inner tube is open (Radius=1/2″).
- The cylindrical tubes are made from MU metal.
- The magnetic field inside the inner tube is almost annulled.
- Optional use with the Geomagnetometer IDR-321 to provide a zero gauss (magnetic field-free environment) reference, enabling you to take absolute readings of the ambient magnetic field (the Earth’s magnetic field is typically around 500 mG)
- Made in the USA