DEM1A001: Basic Type,no communication ,SO output (variable constant),with different measurements way
DEM1A002: RS485 MODBUS/DLT645 dual protocol with different measurements way
DEM1A102: RS485 MODBUS/DLT645 dual protocol, Multi-tariff function,with different measurements way
DEM1A140: Bluetooth communication, Multi-tariff function,with different measurements way
More options to meet differentrequirements from market!