I also use the digital springfield temp/hygro it works great for me first time ever hatching i got 11 out of 16 and 1 more trying i think humitidy has alot to do with it and you cant beat the price.
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That's what I use also, but I have 2 in the bator at the same time just to check them against each other to make sure they are accurate. So far, so good.
we also use 2 of those,we checked them in our first bator before we started our 2nd bator up just to be sure.