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Green and red LED lights respond to sensors depending on the water quality.
Brian S31
Brian S31 May 06, 2013
Green and red LED lights respond to sensors depending on the water quality.

I've seen these sensors...

Often 2
Occasionally 1
Rarely 1
Never 5
What is it? 0
1 Comment     9 Tags
Similar Photos: highway traffic light sensor Natural Power Source. 407 ETR Highway. An advanced electronic toll highway in Ontario that uses sensors and cameras.

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