Portable wind meter has been a bestseller for more than 10 years; Pocketknife-style case makes for easy portability, water-resistant, floating; Accurate to 3% with wind speeds, measures wind from 0.5 to 99 MPH, user-replaceable lithium battery; Tripod adaptable, data lock feature, auto-shutoff, replaceable, non-corroding impeller; Includes limited two-year manufacturers warranty