Measuring from the top of the tank will measure more the humidity outside the tank than in.
And yeah, condensation on the walls = plenty humid. Most people pour the water down the tube (not a LOT, just enough to fill in where the gravel is). I pour directly on the substrate for my tanks that don't have false bottoms.
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."