[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 not be affected by wind direction thanks to the est design of horizontally rotating wind turbine shells can receive the wind speed from 360°. [Multi-function Pro Anemometer]for 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 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 , the "start" button to measure. Second, When the measurement is completed, the "HOLD" button, and the screen 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 , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.