Kestrel 1000 Hand Held Anemometer Pocket anemometer combining high quality, performance and functionality with simple operation to measure and display air speed. Features & Benefits Large easy to read displayAir speed measurementData hold functionSmall robust designPrecision jewel mounted, user-replaceable impellerMaximum and average air speed functionsChoice of measurement units Waterproof (IP67) and floats Support Accessories Kestrel replacement Impeller - This item is sold as a replacement impeller for all models in the Kestrel hand-held instrument rangeKestrel Vane Mount . A free-spinning wind vane, with a cradle, that will attach to a tripod and hold the Kestrel facing into the wind at all times - see stock no. 540-898Tripod Clamp - tripod-mountable clamp that will hold any Kestrel (and other hand-held instruments) securely and fits on any standard tripod - see stock no. 540-876 Display Functions Current air speed (3 second average), average speed since power on (AVG), maximum 3 second gust since power on (MAX), data hold (HOLD) Speed units kt, m/s, km/h, mph, ft/min, Beaufort Force (B) Air speed(1 sec. response) Range 0.4m/s to 40m/s (0.8 to 89.0mph) Accuracy Larger of 3% of reading or least significant digit. Resolution 0.1 kt, m/s, km/h, mph. 1 FPM below 1999 FPM, 10 FPM above 2000 FPM. 1 Beaufort (0 to 12) General Operating Temperature -10C to +55C Dimensions and weight 122mm x 46mm x 26mm; 102g (with cover) Power CR2032 lithium coin cell (RS stock no. 597-201) Supplied with Coin cell CR2032, lanyard, clip on protective hard cover and instructions