Nepenthesis
Formerly known as Pineapple
A 5% difference isn't much of a problem, especially if you average the two out. I use a digital one similar to yours, and also a digital with probe made by zoomed I believe. The probe is nice because often after a while the humidity starts to affect the screens IME.
Good idea averaging the two. I have the digital in the greenhouse right now and the dial in the terrarium, so I can't do that as of this moment. Hopefully the weather will warm up soon and I came move all of the neps into the greenhouse!