Also ask how they do overtime and if it's comp or not, the difference there can mean a few thousand dollars a year, for example I get overtime but a neighboring agency for me gets comp. also ask about if you get holiday pay or not
Reason being if two agencies are offering the same pay those questions can be easily the difference between $1-3k a year more in pay.
I would research the agencies too, try to have as many questions for them as they may have for you. And above all else be honest.