um well that one really doesnt look like it displays humidity...mine has the time displayed on top, temp in middle and humidity on bottom (the humidity is seen as a percentage)
honestly i'd make sure he has 2 hideboxes regardless that way if he should decide he wants to go in one they're there for him. these snakes will sacrifice warmth for security so you wanna give them options no matter where in their cage they are. thats how i see it...
if i'm wrong here someone please correct me...