I have 18 available Solinst Levellogger Model:3001 LT F15/M5 level sensor that complements our other level sensors auction listing. These are very precise water level and temperature data logging sensors. Some of the things these can be used for would be Aquifer characterization, Watershed/drainage basin monitoring, stream/lake/reservoir management, and long-term water level monitoring in wells.  No software or cable, and battery conditions are not guaranteed.