www.thedriller.com/articles/86813-water-level-logging
Water Level Logging
October 1, 2002

The Model WL15 Water Level Logger measures and records ground water, surface water level in boreholes, flumes and weirs. The WL15 data logger has a 1 7¿inch (fits inside a 2-inch well) diameter stainless steel housing. In a borehole application, the data logger cap holds the WL15 at the top of the well and allows use of a borehole locking cap for security. The water level sensor is housed in 3¿inch stainless steel (fits inside 1-inch wells). Six pressure ranges meet a wide range of applications. The 0- to 2-foot range is well suited for shallow ground water to surface water relationship studies. Global Water Instrumentation Inc.