Is it okay to heat a lactated ringer's bag using a sous vide cooker?

I have been told that cats like it better if their subcutaneous fluids are administered from a bag that has been warmed a little bit. I like this idea, but I don’t trust my arbitrary means of heating the water to a good temperature. I happen to have a sous vide cooker which is really good at heating water to a specific temperature. Could I use this to heat the fluid bag to the desired temperature (submerging it in a water bath)?

As a side question, what’s the ideal temperature? (I would assume it’s the same as the cat’s natural body temperature, but I don’t want to make assumptions.)