Jim, this unit already comes with it's own SCART adapter, so he shouldn't need to buy a separate one.
From the web-site:
Comprehensive format support
Very many analog sources can be connected to the TERRATEC G1. Whether VHS, Video 8, S-VHS, Hi8, Betamax or others - almost every device with analog outputs is compatible. And whether your output source is a SCART-output, S-Video or Composite, the TERRATEC G1 is connected to it in no time. Thanks to the comprehensive cable package that includes a SCART-adapter, even beginners can get started straight away. The video source and format are detected automatically and digitised in the highest quality.