Modified listening scopes were evaluated to address the challenges of traditional hearing-aid checks, not accessible to deaf audiologists. Also investigated was the impact of hearing-aid characteristics (prescribed gain, technology level, and manufacturer) on output fidelity using modified listening scopes via a distortion measure. Results were analyzed through a reliability measure to establish internal consistency and agreement between measurements. Findings are useful to those who leverage modified listening scopes, to those with whom they interact, and add to developing literature in this domain.