I have built some wireless sensors for outdoors and have them in waterproof enclosures. However, small amounts of moisture are getting in causing condensation as the temperature changes. After some research, it seems this is a common problem with outdoor waterproof enclosures and that's why companies make breathable membranes for them like:http://www.sealingdevices.com/gore-vents
I have been trying to get a small set of (goretex or similar) breathable membranes but it seems like you can only get them as a manufacturer, not a hobbyist.
So does anyone have any recommendations for how to proceed?