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Could this be used to measure RPM (rotation per minute)?
A small magnet with the North pole painted never runs out of batteries in an ackward moment.
painting the north pole red
However, such devices are sold for $ 39.99 http://www.emovendo.net/magnet/magnet-pole-identifier.html
OP got his inspiration from the long and very detailed discussion about it
How retro... I prefer blue
Quote from: Soeren on April 20, 2010, 05:32:28 AMHow retro... I prefer blue I seriously read "red" paint there. I guess I subconsciously associate north with red =P
I seriously read "red" paint there. I guess I subconsciously associate north with red =P
I've seen a small handle/holder where a magnet was placed in a sort of gimbal at one end of the handle, to show the precise direction of even fairly week mag fields - might be fun trying to make a similar device - a 3D mag field detector using no power at all.
But as Tim "The tool man" Taylor has taught us, more power is more better. Therefor, because that uses no power, it is no better.