Atrato Ultrasonic Flowmeter. The Atrato ultrasonic flowmeter delivers unprecedented performance and accuracy across a broad dynamic range. It has been designed with a clean bore structure that makes it ideal for a range of low flow applications from laminar to turbulent. The Atrato uses patented ‘time of flight ‘ technology that allows it to operate with excellent accuracy and can monitor flow over a range of 200:1. It is easy to connect to a computer by using the USB port to monitor rate and total. It is also possible to modify certain operating parameters like pulse resolution and units. Features and Benefits. Highly reliable and accurate, +/-1.0% of reading. Fast response. 200:1 turndown. Easy to use. Display and analogue output. USB interface. Laminar to turbulent flows. Through bore design. Patented time of flight measuring system. Applications. Laboratory tests. Drink dispensing. Cooling equipment. OEM. Semiconductor plant. Active flow alarms