Quote Originally Posted by shadowsnakes View Post
Non-digital instrumentation can be very inaccurate, especially when you consider the "cheap" options out there.
So can digital ones. I wouldn't even bother, judge it by his sheds, if he's shedding well then the humidity is fine, if he isn't then it's too low. The snake looks fine, small for 3 months but aside from that I don't see any signs of malnourishment. I would agree with increasing to adult mice though, he should be fine and after he eats a cpl toss a live rat pup in and see what happens