Do you know? You should... because if you drive in the LaCrosse area you come in contact with them constantly. By definition it's a magnetic sensor used to detect magnetic fields... or, a magnetic sensor used to detect ferrous objects. Okay, how does that affect you? Because magnetometers are the little device used to control a large majority of the stoplights in God's Country!
And guess what? In my opinion, those little magnetometers are the worst invention ever for controlling traffic... and actually CAUSE traffic jams!!
Interested in knowing more? I'll explain myself tomorrow... stay tuned!
