I don't know about you, but I hate to open a humidor just to check the humidity. I mean, why open it up to let the moisture out, right? But the external hygrometers are often inaccurate. Finally there's a solution. The Xikar Puro Temp Wireless Hygrometer has a remote unit that will tell you what's going on inside the box without opening it. To make it even better, you can get extra sensors so you can monitor up to three boxes with one base unit.