Scientific systems for ultrasound technology as well as measurement and testing technology, namely, ultrasound apparatus and ultrasound instruments in the nature of ultrasound flow sensors, and ultrasound systems comprised thereof; systems comprised of ultrasound components, namely, ultrasound probes and sensors not for medical use as well as accessories for ultrasound sensors not for medical use in the nature of cover screws, flexible inlay in the measuring channel of the sensor housing, sen...