If you like peaking at your eggs and don't want to worry about the temp dropping, you can cut a piece of plexiglass that will sit right inside the top of your cooler on the little lip that goes all the way around. Lets you open it up without any heat getting out...just have to cut it to the right size, grind a little notch for the lid strap and put something like a zip tie through it to pull it open. It's hard to see, but the pic below shows mine...the little blue thing is a zip tie...I drilled two holes and wrapped it through...
The pen is actually sitting on top of the plexiglass lid...not on the egg tub...you can also see the little zip tie handle...
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