Supposedly the water wiggler temp is more accurate, but when I tried using that, mine was reading like 105. This was in the same bator, at the same settings, that I had been successfully hatching eggs in for months, so I gave the wigglers to my son.
But you could always average them, though I don't know how accurate that is. The wigglers are supposed to mimic the internal temp of the egg, so you could go by that one.

But you could always average them, though I don't know how accurate that is. The wigglers are supposed to mimic the internal temp of the egg, so you could go by that one.