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Standard lever-action microswitch, disassembled for your viewing pleasure. Clever action. Available at vadien.com/product.php?id=1037

I saw a magnetic pole detector on a magnet website for $17, and that seemed pretty extreme for literally cents in parts, so I built my own, parts supplied via my own tech and consulting company, Vadien. This device is extremely simple, and consists only of two independent circuits with a hall effect sensor (y3144), an LED, a couple resistors, and a PNP transistor. The polarity is simply defined...

Mix low-carbon fuels with boron-rich compounds and get fire that burns primarily in green spectra! Just like movie magic, but more personal. Obviously, don't burn stuff indoors or anywhere without good airflow, which can lead to carbon monoxide poisoning or suffocation.

Available at Vadien.com under Luminous and Fluorescent!