This machine is AIO for handheld operation. This equipment is a special device for dental use. Do not use this equipment in other places, Root canal apex locator applies to root canal mechanical expansion of dental root canal therapy. It is used for pulp necrosis, chronic gingival periapical periodontitis, chronic periapical periodontitis (including periapical granuloma, periapical abscess and periapical cyst), teeth with pulpal periodontal syndrome and systemic disease that is not suitable to extract a tooth but need for treatment or temporary retention of the root canal, mechanical expansion.