Found the pictures of my homemade incubator from last year. I have four mason jars on each end filled with wet sand for heat sinks. I have water containers and sponges all preposition-ed under bottom screen so I won't have to pull everything out at lock down.Just remove the turner fill with warm water and put eggs back in. The funnel and tubing is used to fill water containers without removing cover.I control the Temp. with a STC 1000 controller, about $ 20 bucks on ebay. I have three or four thermometers, but put all my faith in the spot check and use the others for reference. Last year I kept the humidity around 30-35 % until lock down then upped it to 70 % and it worked out great. But will have to watch the air cells to see if that will work again. That's my rig it seems to be working so far. .