Wire smart water meter, wireless smart water meter, ultrasonic water meter, Lora wireless smart water meter, heat meter, cooling meter(BTU meter), for hot and cold water metering. Small-caliber DN15-DN40 for family, industrial large-caliber over DN50, remote data transmission and reception, MBUS or RS485 interface.Ultrasonic measurement under high precision and high stability.Working life more than 7 years .