Would it happen to be something like this? https://zoomed.com/digital-combo-the...umidity-gauge/
If so, then that's what my sibling and I used to start out with (for their gecko and my snake respectively), but we both ended up switching to other devices. Mine overestimated the humidity level, so it was reading humidity in the 70% range while my snake was still having bad sheds. The one in the gecko tank, on the other hand, was reading way too low, reporting humidity around maybe 30% when the tank was practically dripping with moisture, and eventually it just got permanently stuck on 10%. We both now use the Acurite digital thermometer/hygrometer, which is pretty reliable while also being quite budget-friendly.
For temperature, you also may want another way to monitor it in addition to your current thermometer. An infrared temperature gun is going to be your new favorite toy, if you want to be able to just point and click to check the temperature at any specific spot in your snake's enclosure ... or the rat you just thawed and warmed up ... or your coffee mug, if you're bored ...![]()