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I use 2 at the same with no problems at all. Just label them units 1 & 2 or A & B so you wont get them mixed up. They are great units. I never lose signal and my smoking area is at least 50 feet from my living room, plus theres 2 walls in the way. Goes through walls just fine. Plus theres a sexy voice that lets you know your meat is "almost done". I give the unit 2 thumbs up.
I love my Oregon Scientific. As stated earlier, they are only $9.99 at lowes. My pit is in my backyard, works great in the house. I decided to go out front, worked all the way to the street!
the NU-701 and two of the NU-751 expansion modules. It is cheaper from this link http://nu-temp.com/tvwb/ hope that is OK to post Very happy with mine and my friend has one his is great as well.
Mike