Measures the variation in the inclination and declination of the Earth’s magnetic field with time, and can be configured as a stand alone instrument (GSM-19FD v7.0) or simpler version (GSM-90F5D). Both systems require a computer to log, convert and display the data. The GSM-19FD v7.0 can store the raw dIdD readings. Both versions come with required accessories as follows:
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