This document introduces the R1 Pocket Air Velocity meters product series from Extech Instruments Corporation in 2007-2008, including the Mini Thermo-Anemometer series and its accessories. The products feature a fold-up protective housing, a large dual display, data hold function, auto shutoff function, water-resistant housing, etc. The Mini Thermo-Anemometer series can measure air velocity, temperature, and windchill index, and Model 45158 also has the measurement function of relative humidity and dew point.