Your best bet is to stop trying to measure your humidity. If you want some kind of probe means of measuring it, you're going to be paying WAAY more than the information is worth.
If your setup requires no humidity adjustment on your end to maintain your snakes, you're fine. Just do the good/bad test and do microadjustments to tweek it until you only need to adjust it a few times a year. My own snakes have a high and low humidity adjustment. One side of their tubs has 4 1/4" holes in it. During the winter the holes point in on my rack, which increases the humidity in the tub relative to the room. During the summer the holes point out, which decreases the humidity in the tub to approach that of the room. It requires no intervention on my part, condensation translates to defication/urination. Which is exactly what I want.
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