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There are currently three variations of the Wattmon device: Wattmon, WattmonPRO, and WattmonMINI.
The Wattmon original hardware is no longer in circulation.1)
The WattmonPRO is the most flexible device with multiple interfaces and built in IO ports.
The WattmonMINI is a reduced version of the WattmonPRO with a single Modbus RTU port.
The WattmonMEGA is an upcoming hardware that will be 4x faster and have 4x more memory for larger applications.