[Higher Accuracy of Anemometer]Wind Speed Range:0.7-42m/s(Accuracy:±4%Digit), Resolution:0.1m/s. Temperature Range: -10℃-45℃/14℉-113℉(Accuracy:±2℃). Measuring result will not be affected by wind direction thanks to the newest design of horizontally rotating wind turbine shells can receive the wind speed from 360°. [Multi-function Pro Anemometer]for BTMETER BT-881M have functions of Wind Speed/ Wind Temperature. 5 wind speed units:m/s,km/h,MPH,Knots,Ft/min; Temperature (℃/℉),Current/ Max/ Avg, The measurement content is more professional and the measurement data can be hold. [LCD Large Screen]With a Large LCD night screen to display the data(Current/ Max/ Avg wind force,Beaufort-barg raph),so the result will easy to read.The measurement data can be clearly obtained even at night. [Pocket Handheld Anemometer]Portable Size: 6.5 x 2.1 inches; 2 x 5V AAA batteries(NOT Included). At the bottom of the anemometer, there is a hole for tripod, Then you can get a precise value because of this tripod's stability. Wind Speed Range: 0.7-42m/s Accuracy of Wind Speed: ±4% Digit Resolution: 0.01m/s Wind Speed Unit Selection: m/s,km/h,MPH,Knots,Ft/min. Temperature range: -10℃-45℃/14℉-113℉ Accuracy of Temperature range:±2 ℃(± 3.6 ℉) Data Hold Button: Hold Button which measure the Max/ Avg / Final value within a period of time. First, fix the anemometer at the place where you want to measure wind speed ,press the "start" button to measure. Second, When the measurement is completed, press the "HOLD" button, and the screen will display "HD" symbol, which means that the measured value is locked. Colour:As Shown Material:plastic Package Contents: 1 x Digital Anemometer 1 x Screwdriver(Due to different product batches, the appearance may vary, which does not affect the use)