I hate humidity gauges

I think the BEST way to gauge your overall humidity is to watch your snake and see how they shed. The gauges are important to have so that you at least have a baseline to go by, even if it's not a true measurement. If your hygrometer says your humidity is consistently 50%...but your snake is shedding poorly, then work on bumping y0ur overall humidity by another 10% until the next shed and see if that helps.

You can judge that your humidity is TOO high simply by how wet it is in the enclosure. If there is frequent moisture building up on the sides of the enclosure, or if the substrate is always damp/wet...then you should work on ways to lower the overall humidity.

In most of our modern houses, it's unlikely that the ambient humidity will always run dangerously high. If the enclosure has enough ventilation, that shouldn't be something you need to worry about. Being too dry is the biggest issue for the vast majority of bp owners. And so long as your snake has consistent, complete sheds (not even necessarily all in one piece...but sheds that they are able to complete on their own without intervention from the keeper)...then you can be confident that your humidity is fine.