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Links to the people selling them, using them? IE, a check that this is a "real" mode of stupidity? ħumanUser talk:Human 02:47, 24 May 2011 (UTC)

Yeah yeah, I was getting there. Hold your horses. --DamoHi 02:51, 24 May 2011 (UTC)
Anyone actually popped open one of those and found actual sensors and circuits to sense those EM fields and Temperature? My guess is if the iphone app works exactly as the device without the sensors then the putative sensors in the actual device probably doesn't work anyways. ThiehZOYG I edit like Kenservative! 16:27, 4 March 2012 (UTC)

Are you sure there is no emf sensor on a iphone (or any other smartphone) ? What do you believe is the magnetic compass, in a smartphone, used also by GPS system ? — Unsigned, by: / talk / contribs 12:04, 29 May 2015 (UTC)

Phone compasses use magnetoresistive sensors or Hall-effect sensors. Three miniature magnetometers, at right angles to each other, sense the surrounding magnetic field, which is not the same as the ambient EM activity. The phone's accelerometers sense its orientation with respect to gravity, aka "which way is up" so the phone does not need to be held level in the hand like a conventional magnetic-needle compass. Flux gate gamma (talk) 15:07, 29 May 2015 (UTC)