To you: All our products are quality guaranteed. If you have any questions about our products, please feel free to contact us. After we see the message, we will reply to you as soon as possible. Thank you very much for your purchase    (Newest Anemomete) Digital Cup Anemometer Air Flow Meter for Measuring Air Speed Air Volume for HVAC Vents,Shooting,Boat Sailing  ☀ Wind Speed Range: 0.7-42m/s(MAX up to 93mph) and Accuracy of Wind Speed: 0.1dgts. ☀ You will know the hurricane trend before going out. BT-876 anemometer provides fast measurement for analysis of critical environment conditions. ☀ Wind Speed, wind chill in one LCD display. Digital Anemometer Handheld measure wind speed in 5 units: m/s, km/h, ft/min, knots, mph. ☀ With Compass function, 8 days data Record and recall Max/Average/Current function. Beaufort-Bar Graph, Low battery indication. Screw hole in the button can be connected a lanyard. ☀ We have perfect quality warranty. If the meter what you received have any quality issues, please contact our After-sales personnel in time and we will serve you in good faith.  Product Specification:  √ Resolution:0.1 m/s √ Accuracy:typ. ±4%, ±1 Digit √ Operating temp.range: -20~ + 50 ℃ √ Storage temp.range :-30~ + 70℃ √ Auto power off:affter app. 8days √ Power: CR2032, replacable (Not Included). √ Color: show as pictures. √ Size: 143 x 63 x 28mm √ Weight: 95g  Packing List：  * BT-876 Cup Anemometer x1 * English Manual x 1