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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: Radio Station Tower Survey This tunnel has sensors that monitor the amount of air flow and visibility as well as the presence of gas emissions.

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