Question about temperature.

I checked the FAQ and I couldn’t find the answer. But I feel like I must be missing it somewhere....so hopefully someone can help me.
When setting the temp on my new ys640s the top of the screen toggles between “+/-25” and “+/-5”. what is the purpose of this? Does the +/-5 really hold a tighter temp range?
Thanks for any help
Jake
When setting the temp on my new ys640s the top of the screen toggles between “+/-25” and “+/-5”. what is the purpose of this? Does the +/-5 really hold a tighter temp range?
Thanks for any help
Jake