Alnor RVA501 Digital Anemometer with Rotating Vane is designed to measure air velocity, air volume, and temperature in both English or metric units. The Alnor RVA501 features an innovative sweep mode for an overall measurement of large areas, ability to store and recall data readings, download readings to PC via LogDat2 software, and a 50-6000 ft/min (0.25-30 m/s) measurement range.