The highly integrated T3-1-2-K sandwich-type ultrasonic water meter is designed and manufactured strictly according to GB/T778.1-2007,ISO4064-1:2005 etc., based on ultrasound transit-time measurement technology. This series sandwich-type ultrasonic water meter is a new type of water meter specially designed for agricul tural irrigation, garden management and water resources monitoring. The water meter has some advantages,such as low cost, high measurement accuracy, low power consump tion, stable and reliable operation and so on.