Fireboard app

haven't purchased my 640s yet, but was thinking about getting the fireboard stand alone unit. This way I can get used to the app, and when I get my 640s & do a lot of meat, I can have more than 2 probes recording temps.
How would that work on the phone app? Would I have 2 separate fireboard units listed on the app, and switch back & forth between each unit to read the temps?
thanks!
How would that work on the phone app? Would I have 2 separate fireboard units listed on the app, and switch back & forth between each unit to read the temps?
thanks!