1.EN14154-2007; ISO 4064; IP68 2.Permanent optical port communication,With standard M-bus protocol 3. 8 digits+LCD; Class 2 Ultrasonic Water Meter is an ultrasonic flow sensor that measures the velocity of water by using the principle of ultrasound.All measurements, references, readings and calculations are controlled by a microprocessor in the calculator top. The accumulated water consumption is ...