Hygrometers are all over the board. Good ones can be bought for not a huge amount of cash the best are calibratiable ones in either digital or analogue either will work. Cigar humidor ones seem to be the best.
On to climates. The enclosure is a simulated environment of the native region. There needs to be a temperature gradient typically 80-90 although as much as 76-94 can be ok too. Personally I keep 80-90 there is no risk at this point. The humidity between 50-80% is ok. The low end is fine but during a shed it is ideal to bump it up.
Inside the enclosure there are also areas that differ from the over all. Inside the hot hide will be hotter than the temp on the top of it. The humidity inside the hides also as it is an enclosed space will be higher. Snakes like mammals break out water vapour and that will raise humidity in an enclosed hide somewhat. Typical temp/humidity might look like this, The average temp of the air mid way up the sides and between the hot and cool sides should be 82-6 or so at least in the 80s The 'floor temps hot and cool often are 78 and 88 or so but INSIDE the hides you will likely see something like 80 and 90 or so. The humidity in the enclosure might be only 50% but the humidity inside the hide especially with a snake in it could be 5-10% more than average.
The ability to measure inside the hides is a advantage but the cheap digital dual probes are not great for accuracy and the humidity is often quite bad. Temps are much more important than humidity. Temperature dictates all metabolic functions of the snake, too cold it cannot digest reproduce or in an extreme have enough energy to move at all. The reduction of the immune system will cause illness too. Too high they become stressed and 'fidgety' and will not eat could also be burned (exposure to 100ºF for a period of time will cause a burn). Low humidity is an issue as well but is tolerated better with less severe effects. LGray23 has given you good advise you should pay attention. Read the care sheets and buy a decent temp gauge and then look for a humidity gauge most of the combos are ok but not great for accuracy, typically 2ºF +/- and 10% humidity. It varies but that is typical.
Alex
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