But thermocouples are plagued with vexing subtleties, so the novice should use an analog-to-digital converter that comes with built-in hardware to interpret the thermocouple signals. National Instruments in Austin and Vernier Software in Portland, Ore., sell such systems

Using his device, Diverdi has obtained some impressive results. If his example inspires you to follow suit, please share your experiences through the Society for Amateur Scientists's Web page.

This article was originally published with the title An Automated Precision Magnetometer.

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