I think people use the SCT Xcal 2 for tuning. If you can find an Xcal 2 then go for it I'd say.
I checked the website and all they have available is the SCT SF3 or the SCT X3.
The X3 is the one where you can write your own tunes. It does not come with any pre-written tunes.
The SF3 comes with pre-written tunes. You can't change or modify them.