| Earth Magnetometer - Unique Ghost Hunting Equipment (2030 words) |
 | Since the earth's field fluctuates by typically 3-30 nanoteslas per hour, a resolution better than 1 nanotesla will not be of much additional benefit. |
| Until now, resolution of 1 nanotesla or.01 milligauss could be achieved only with very expensive, heavy, and high-power-consuming magnetometers such as proton-, overhauser-, and cesium- types. |
| Because.5% of 500 milligauss is 2.5 milligauss (=250 nanoteslas), this may seem to be a problem when reading changes in the earth's field from one point to the next with precision of.01 milligauss (= 1 nanotesla). |
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