Allegiance Digital water level recorder with telemetry We offer Digital water level recorder to monitor water level in Tubewell, Borewells, Dug wells as per CGWB guidelines. Our system is full proof and installed at diff. locations all over India. Piezometer Digital Ground Water Level Recorder Piezometer - Digital water level recorder offered. Digital Water Level Recorder (DWLR) is a system used to measure groundwater level. It is designed to calculate the water column on hydrostatic pressure.