Factory calibrated to within +/- 0.25% accuracy. Simple operation, large LCD screen. Meters and feet per second readings. Wide sun screens with LED light panels for indoor and outdoor use. Option to interface with smart phone via included 25' audio jack cable. App displays velocity, logs data, notes, weather conditions, and easily exports via SMS or email. Integrated rod holders and cord holders. Includes: Carry case, light panel battery pack, light panel AC power cord with 220V adapter, Y splitter cable with on/off button. Adjustable tripod can extend from 16'' to 51''. Boxed.