This thermometer is not worth $50, I would see if there is anything else with similar specs.
I mean for $50 you could get a few cheap thermometers with less individual functionality and still spend less. I recently picked this up from Walmart for one of my cages. All it does is measure humidity and 1 temperature (no probe) $8 or $9
I'm sure you could find a simple probed thermometer as well and still spend under $50