I've found the same thermometer I have. This is it: https://www.amazon.co.uk/Lucky-Repti...and+hygrometer
Honestly I can't keep pissing money like this down the drain. It says the probe is protected from humidity in the description. Though it says it can be placed "outside" of the enclosure, how would it read humidity? Wouldn't it just read the humidity in the room rather than inside the tub itself? I'm confused...
Anyway, I actually have my thermostat on the maximum temperature so I can't raise it any higher otherwise I would have done that already. The temperature with the probe UNDER the paper towel, has hit 88F exactly and has 61% humidity.