How should I handle “how to inspect dual battery isolator” when shopping for “dual battery isolator”?

Inspect “dual battery isolator” before installation: compare the label, connectors, dimensions, mounting points, and included hardware with the removed component. For safety-related work, check open recalls through NHTSA and follow the manufacturer procedure or use a qualified technician. End with a go / no-go rule the reader can apply without jargon.