Crocdoc
"Getting back to those first test digs in the nest box that I mentioned at the start of this post, they are usually in the form of what I call 'nose holes'. She digs a bit and then pushes her nose right into the substrate, forming a little conical hole. I can't say for sure, but if I were to guess I'd say monitors use their snout to determine the temperature within potential nest sites."

I couldn't agree more.
When my female Jobiensis laid 2 clutches in the substrate(rather than the nest box I couldn't see these events) but the open nesting she did do a small dig and the snout test.
I believe this in not only to check temps but humdity as well.
Mike

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Mike's Monitors!