The Geokon Model 4573 Series Dataloggers deliver precise measurement of water levels and temperatures in boreholes, wells and wetlands. Each model is designed for a certain environment. The 4573-1 (s/s) is the standard model for most applications. The 4573-2 (Titanium) is the ideal choice for saltwater environments, while the 4573-3 (polypropylene) offers a low-cost option for less demanding applications. Each is lithium-powered for long life and available in multiple pressure ranges.