Everything points to the ab1 to scf conversion being searched as a way for export between two DNA tracer formats, to be more specific, between the ABIF format and the generic SCF DNA sequence format.
According to the Internet, Chromas / ChromasPro or similar DNA analysis tools are the best when it comes to importing / exporting various types of DNA data. The free version of Chromas lists both .ab1 and .scf files that are supported for ab1 to scf2 export, so it's probably the best tool to start with. But it is very much possible that you can find other, similar tools that can be used for the same reason.