supply, installation, and commissioning of 392 nos digital water level recorders (vented/non-vented pressure type) with telemetry, including rain-gauge, fencing, and establishment of data acquisition system supply, installation, and commissioning of 392 nos digital water level recorders (vented/non-vented pressure type) with telemetry, including rain-gauge, fencing, and establishment of data acquisition system , digital water level recorders (dwlrs)-non - vented pressure type / acoustic type, with telemetry system , digital water level recorders (dwlrs) with non-vented pressure/vented sensors & with barometric pressure correction with rain-gauge for individual station with measurement range specified in table 1 – list of piezometer sites and 50meter sensor cable along with junction box and 5-meter signal cable and necessary accessories with battery operated data logger and telemetry system based on gsm & gprs, complete as per the technical specifications .