The Kestrel 1000 Pocket Wind Meter is a compact and simple tool perfect for outdoor sports aviation sailing/boating and anyone who needs accurate wind speed measurements. It measures current average and maximum wind speed with total accuracy up to 135mph. The rugged design features a protective slip-on cover and large east to read display. The Kestrel 1000 is fully waterproof and floats (IP67) drop-tested to MIL-STD-810F standards and features a user-replaceable patented impeller. It accurately reads a wide range of wind speeds and has a low startup speed. Use in construction operations to monitor added wind load on mobile crane operations and prevent damage and safety hazards. Bring along the waterproof floating Kestrel 1000 when windsurfing or boating to provide accurate measurements right where you are and assist with sail setup on small or large crafts. The Kestrel 1000 is proudly designed and manufactured in the USA and is backed by a 5-year warranty.