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TSI is a leading manufacturer of precision measurement instruments, including anemometers. In 1971 TSI started work on a project to design a wind speed velocity sensor—or anemometer—that is sensitive to low winds and winds in a low-density atmosphere. Of the 60 anemometers created for NASA, six went on to Mars, installed on the Viking spacecraft.Today, TSI’s popular anemometers are the Alnor RVA501 Anemometer and the VelociCalc® Air Velocity Meters. The VelociCalc® is a hot-wire sensor to measure air velocity and temperature, and it can also calculate air volume flow rate.