I would go with digital thermometers for ambients over the dial. Also, I find the lazer temp gun essential (I can peak in quickly, shoot the hot spot, and know immediately that the temp there is good). Most here will insist on a t-stat for any heaters (one for each heating device). I've gotten away with the inexpensive Hydrofarm for kings, but the balls may do better on the proportional Herpstat or Vivarium Electronics.
Very jealous of your Exo-Terra. Lots of hides will help a ball imagine it is at home deep in the recesses of a termite mound. Otherwise, for a tiny baby you might want to start off with a small tub. I don't keep balls, buy I think an RHP and a UTH will be your best bet for proper ball temps, based on your reported room temps.
Please keep us posted!
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