Ultrasonic water flow meter

Features:

1.Ultrasonic with time-difference measurement with high precision
2.Measuring mechanism has no moving parts,and no wear and tear forever
3.low pressure loss,   ultrasonic flow meter for arduino 
4.Not affected by the intermediary impurities, chemical characteristics and magnetic materials
5.Easy installation, horizontally,vertically or incline
6.Straight through acoustic channel, signal without interference
7. External structure meet all the installation requirments
8. Without reflecting surface in acoustic channel,no stopping for Positive and negative flow