HHJ Pro English Articleshttps://hhjpro.com/en/articles/HHJ Pro product notes, iPhone compatibility, setup guidance, and location testing knowledge.enWhat is HHJ Pro? Connections, features, and requirementshttps://hhjpro.com/en/articles/what-is-hhj-pro/https://hhjpro.com/en/articles/what-is-hhj-pro/Wed, 22 Jul 2026 00:00:00 GMTHHJ Pro is external location-testing hardware for iPhone. Learn how its two connectors work, what the app can do, and what to check before use.