FieldVista is a universal home‑chemistry platform built around a $50 handheld optical analyzer and ultra‑low‑cost cartridges. The system gives homeowners fast, accurate soil readings (NPK, pH, salinity, micronutrients) and converts them into clear fertilizer recommendations. Cartridges cost $0.25–$0.50, enabling frequent testing and strong retail scalability. The same handheld supports additional cartridges for pool water, drinking water, and home‑system chemistry, creating a flexible, high‑volume platform for consumer lawn and garden partners.