the thermometer should go beneath the substrate as you need to be measuring the absolute hottest spot in the enclosure, which would be below the substrate over the UTH.
i have to ask: is your UTH regulated by a thermoSTAT? ALL heat sources MUST be regulated, including the IR bulb.
This may be an incredibly stupid question, but UTH have obviously been around for a while. Anyone know a reason why no manufacturers have made one with a built in thermostat? Seems like it would be a no brainer.
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Ball Pythons
0.1 Spinner -“Cuddle Bug”
0.1 Banana YB - “Chiquita Bonita”
0.1 Super Lesser BEL - “Daenerys - Mother of Dragons”
1.0 Pastel Highway - “Lt. Pete ‘Maverick’ Mitchell
1.0 Super Citrus Bearded Dragon hopefully shipping mid-March, name pending.