How to tell when mouse wheel scrolling has reached its limit

I’m making a zoom system.

Basically if you already know scrolling your mouse lets you zoom in an out of your character. I want to make it so when the character zooms into their character enabling first person and they keep scrolling i want the fov to lower instead, and when zooming back out for it to rise until it gets to its default value (70). Once 70 fov is reached and the player keeps on zooming out the game makes it so he can exit 1st person

I think you can see where I’m trying to get at here. This isn’t limited to mouse scrolling, same for the I and O keys on the keyboard (that do the same functions) So how would I go about doing that? I’m not a master at scripting so any help would be fine