The Product description refers to the range of water level fluctuation the unit can tolerate. e.g. The F15/M5 Model can handle approximately +/- 15 feet or +/- 5 meters of change in water level at its deployed depth.
Model 3001 Levelogger Edge (Full Scale WL Range; Water Level & Temp.)
Model 3001 Barologger Edge (Barometric Pressure)
Model 3001 Levelogger Junior Edge
Model 3001 LTC Levelogger Edge
Model 3002 Rainlogger Edge