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Do It Yourself outdoor case for AirVisual Node using plastic air vent grilles and plastic flower pots. 
Some cuts and glue
Those outdoor installation was successfully registered and used for 1.5 years.
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Yes, buying two AirVisual nodes is expensive. And Yes, creating that kind of case, mounting, setup/register as outdoor takes a lot of hours. 
Outdoor and Indoor node data
What do you see
What community see from your node
