supply, installation, testing and commissioning of 600 digital water level recorder (dwlrs) (non-vented pressure type / acoustic type) with telemetry, including fencing and establishment of data acquisition system along with its maintenance for real supply,installation, testing and commissioning of 600 digital water level recorder(dwlrs) (non-vented pressure type / acoustic type) with telemetry, including fencing and establishment of data acquisition system along with its maintenance for real , digital water level recorders (dwlrs)-non - vented pressure type / acoustic type, with telemetry system , digital water level recorders (dwlrs) with non –vented hydrostatic pressure type sensor with barometric pressure correction for individual station, with measurement range ofup to 50 mt along with sensor cable, as per list of installation sites specified in table-i, including junction box and necessary accessories with battery operated data logger and gsm & gprs telemetry system, complete as per the technical specifications. or digital water level recorder, with acoustic type water level sensor with measurement range ofup to 200 mt, as per list of installation specified in table-i, along with interface cable including junction box, with all necessary accessories with battery operated data logger and gsm & gprs telemetry system, complete as per the technical specifications. (bidder should clearly specify the type of offered dwlr system in the technical responsiveness form)