1.Speedometer Accuracy Improved,Wind Speed Range: 0.7-42m/S (Accuracy:4%),Resolution: 0.1m /S. Temperature Range: -10 - 45/14 - 113(Accuracy: 2). Thanks To The New Horizontally Rotating Wind Turbine Housing Design, The Measurement Results Will Not Be Affected By Wind Direction And Can Receive 360 Wind Speed. 2.Multi-Function Pro Anemometer, Bt-881m Has Wind Speed/Wind Temperature Function. 5 Wind Speed Units: M/S, Km/H, Mph, Knot, Ft/ Min; Temperature (/), Current/Max/, More Professional Measurement Content, Measurement Data Can Be Stored. 3.Long Lcd Display,There Is A Large Night Lcd Display Showing The Data(Actual Wind Speed/Maximum/, Beaufort-Bagraph),So The Results Are Easy To Read. Measurements Can Be Clearly Obtained Even At Night. 4.Manual Speedometer,Portable Size: 6.5x2.1 Inches; At The Bottom Of The Anemometer, There Is A Hole For A Tripod, So You Can Get An Accurate Value Because Of The Stability Of This Tripod. 5.Storage Battery,If No Operation Is Performed Within 15 Minutes, It Can Be Automatically Shut Down. Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use 1.Model: -881W 2.Power Supply: 2 1.5V AAA Batteries (Not Included) 3.Type: Digital Anemometer 4.Measurement Objects: Wind Speed, Wind Temperature, Black Ball Temperature, Humidity, Central Index 5.Measuring Range: 0-30 Meters/Second Colour:As Shown Material:ABS Package Contents: 1x Anemometer 1x Storage Bag 1x English Instruction Manual 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.