Designed for long term unattended operation in applications such as underwater degaussing ranges where retrieval and repair cannot be readily achieved. This instrument offers the highest digital resolution of any fluxgate magnetometer in existence. It features automatic cancellation of Earth’s magnetic field under software control. Nulling parameters are stored in flash memory so that power outages do not upset the instrument magnetic baseline. The instrument has a built in 16 bit accuracy calibrator to insure full confidence in instrument performance at all times.