FIDE (and anything under FIDE rules) does certify some purpose built digital recording devices, they are hilariously expensive and hilariously crap but they exist.
The USCF certification requirements are here . This also includes a list of USCF certified electronic scoresheets.
I like ChessNoteR almost as much, and it's USCF-approved. Not FIDE-approved yet, but they're working on it.