1,Data retention, storage, and deletion functions can better collect measured data. 2,Large‑screen LCD display, display data clearly and visibly, so as to better measure and record. 3,With 500 data records, it is more convenient to find data and avoid data omissions. 4,High‑accuracy measurement, accurate measurement of key data such as wind speed and air volume. 5,Low battery indicator and automatic shutdown function, timely response to power, maintain longer battery life. Item Type: Anemometer Model: GM8909 Material: ABS Battery: 1.5V 3xAAA Battery (Battery Not Included) Purpose: It is suitable for the measurement of wind speed and direction. Wind Speed Range Unit Wind Speed Range Resolution Lowest Starting Point Accuracy m or s 0-45 0.1 0.3 ±3 percent ±0.1 Ft or min 0-8800 19 60 ±3 percent ±0.1 Knots 0-88 0.2 0.6 ±3 percent ±0.1 km/h 0-140 0.3 1 ±3 percent ±0.1 Mph 0-100 0.2 0.7 ±3 percent ±0.1 Air Volume Range Unit Range Resolution Area CFM(FT³ or MIN) 0-999900 0.1-100 0.001-9999 CMM(M³ or MIN) 0-999900 0.1-100 0.001-9999 1 x Anemometer (Battery Not Included) 1 x Speed Measuring Rod 1 x Manual 1 x Toolbox Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.