I have nearly completed Carl Morelands gradiometer and it is working. The final data logging is achieved by using a cheap DMM with RS232 output and a free data logging software program loaded onto a Raspberry Pi. To save carrying a monitor, mouse and keyboard the Pi talks wirelessly to a cheap 7" Android tablet. The only part I am struggling with is the ability to take readings manually rather than at automatically set intervals.
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Carl's Gradiometer
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