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city level monitoring water level monitoring multi-point level detection wireless level gauge RoHS compliant level transmitter river wate remote level measurement 4G level sensor corrosion-resistant level sensor digital level display RS485 Modbus level gauge DTU level transmission China level sensor HART protocol level sensor tank overflow prevention NB-IoT level meter remote level measurement magnetic flap level gauge industrial level control smart city level m explosion-proof level transmitter level alarm system ultrasonic level sensor flo