1Data retention, storage, and deletion functions can better collect measured data. 2Largescreen LCD display, display data clearly and visibly, so as to better measure and record. 3With 500 data records, it is more convenient to find data and avoid data omissions. 4Highaccuracy measurement, accurate measurement of key data such as wind speed and air volume. 5Low 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/s 0-45 0.1 0.3 3%0.1 Ft/min 0-8800 19 60 3%0.1 Knots 0-88 0.2 0.6 3%0.1 Km/h 0-140 0.3 1 3%0.1 Mph 0-100 0.2 0.7 3%0.1 Air Volume Range Unit Range Resolution Area CFM(FT/MIN) 0-999900 0.1-100 0.001-9999 CMM(M/MIN) 0-999900 0.1-100 0.001-99991 x Anemometer (Battery Not Included) 1 x Speed Measuring Rod 1 x Manual 1 x Toolbox