What is a good dBm reading?

My WiFi Analyser app shows the readings for dBm. I have two routers, one shows channel 1 the other Apple Airport shows channel 7. Not sure what I am looking at here?

I would say anything between -50dbm and -40dbm is pretty good. Anything above -40dbm is excellent. According to Wikipedia, maximum power is at -10dbm and minimum is at -100dbm.

In addition, you want to find a channel that gives you maximum separation between your signal and your neighbors signal. If you can get 40dbm of separation, then that’s excellent.

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