IR temp gun, any brand or model.

I use Acurite brand tabletop hygrometers, little ones, and hang them in the enclosure somewhere. So long as humidity is not crazy out of range, she'll moderate it. Same with temps, really -- just run the enclosure as always, and she'll figure out what's the best spot to sit.

FWIW, I maternally incubated brongersmai once, and that's the extent of my experience. It went very well (top 10 list of coolest reptile things ever, actually), but N=1 is what it is.