Lutron GU-3001 is a precision milli gauss meter.

Resolution:
– 199.9 mG to 199.9 mG.
200 mG, -200 mG
– 19.99 uT to 19.99 uT.
20.0 uT, -20.0 uT.

Accuracy ± ( 2 % + 2 mG )

DC/AC miligauss Magnetometer
DC and AC magnetic field measurement
Wide measure range: 3,000 milligauss
N pole/S pole indicator
RS232/USB computer interface
The meter can detect the magnetic fields as small as 0.1 milligaus
Auto shut off is available to save battery life
Power supply from batteries or DC 9V adapter in