Meatech designs and integrate systems for unattended, long-term monitoring of water level and flow. They are used in many environments, including wells, dams, streams, weirs, storm-water systems, and water or waste-water treatment plants. They are reliable regardless of salinity level, pollution level, or other harsh environmental conditions. Campbell systems can communicate on licensed-frequency radio, IP cell modems, spread-spectrum radio, GPRS modem and other methods.