"This little thing isn't worth the plastic it is made of, gauge was all over the place, and was rarely correct. I was worrying about my Ball Python's humidity in his tank, took steps that I knew would fix the problem, but gauge was still all over the place. Bought a digital hygrometer and everything was actually fine. Lesson: DONT WASTE YOUR MONEY, TIME OR FRUSTRATION ON THIS PRODUCT! BUY A DIGITAL!"