Most folks ultimately prefer the Taylor salt kit but I've found the salt stip to cross-corroborate (I have both). You're really only testing salt on initial startup or the end of cell life, and the rest of the time, what the unit reads is what matters, so I think you'd be one ith the strips.
Re cya, have you added the amount required/shown via Pool Math? If so,wait for it to read, though IME it usually reads after 24 hrs if you massage to sock vigorously to dissolve.
You havent backwashed since adding, have you?
You want to give the salt a good day or two to dissolve fully so you can go ahead with that part anyway and check cya again, tell s how mch you've now added, etc.
Ideally, you start up the generator when you're at target for cya so that things get off to a good start in terms of maintaining your minimums.