The WLT-904 is a programmable RTU water monitoring system. The WLT-904 water level transducer is designed to monitor water level and status information from remote locations with a high degree of accuracy. This RTU transducer is used to convert water level information, measured in a remote stilling well, to a telemetry output using an on-board modem.

The WLT-904 is completely programmable using BASIC instructions. This allows the WLT-904 to make calculations such as: rate-of-change, flow, high & low limits, alarm conditions.