The Plexus Controls Precision Level Reader System (PLR) permits field staff to use the portable system to take water depth measurements from sites with depth measurement tubes already installed, avoiding well cap removal and exposure to potentially harmful gasses. Using an internal air pump, the PLR pressurizes a hose that is installed permanently inside the well and calculates the water depth from the pressure (or differential pressure) value. The system offers a host of user features to speed up the read and data logging process such as local save and recall of well site information (casing height ASL, tube depth), and provides a water level calculation of height above sea level.