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I'm thinking of ordering the Brinsea Octagon 20 Eco. It comes with a glass thermometer, but no humidity info. How does this figure in the the "wet bulb" and "dry bulb" stuff I am reading about?

I am on the verge of ordering an incubator (thanks, all you BYC enablers ), and it does not have a built-in humidity sensor/display. Can I buy one somewhere to put in? Which one works the best? I want to hatch duck eggs.