Seven2Go S8-Basic; pH/Ion portable meter.High quality data on-the-go.Seven2Go Pro’s simplified menus, LED Status Light and uFocus measurement screen provide mobile users with fast, high quality data.Comfortable One-Handed Operation.Seven2Go's easy-to-reach hardkey buttons and sleek design ensure comfortable one-handed operation. even in wet conditions and prolonged use.Rugged investment that lasts.Seven2Go Pro's IP67 design, sunlight-proof screen, and rugged uGo carrying case ensure reliable data, even under harsh and isolated conditions.