I was going to go with a II but going to get two Herpstats instead (One for Rack, one for Incubator)... But to answer your questions, I do believe it does come with two probes.
My Thermostat backup is just a little crappy Repti-Temp 500R... Although it is not connected to anything. If it so happens that my Herpstat fails, I will just hook up my Rept-Temp real low until a new Herpstat comes in the mail. (Only took about 3 business days for my Herpstat to arrive - and I live in Canada.)
The Herpstat I have was really straight forward and the instructions were easy to follow. Also, Dion has exceptional customer service so if you ever have a problem or question, he is quick to help.
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