Dear buyers, if you have any questions about the product, you can ask questions at any time in the Question interface.Features: The digital multi-function anemometer is a professional instrument for measuring wind speed, temperature, and humidity. It is widely used for wind speed measurement in factory, school, office, traffic, family and many other various occasions. Measuring the wind speed, air volume, temperature and humidity. Measuring wind speed/air volume max/min value function. Air volume 2/3 MAX value, average value measurement. Wind speed/air volume and temperature unit selection function. Measuring wind direction angle function. Designed with USB for connection with computer and real-time measurement. Backlight and data hold function. Low battery indication function. Automatic power on/off setting function. Specification: Model: GT8907 Wind speed measurement range: Unit Wind speed range Resolution Minimum threshold value Precision m/s 0.045.0 0.01 0.3 3%0.1 Ft/min 0.08800 0.01/0.1/1 60 3%20 Knots 0.088.0 0.01 0.6 3%0.2 Km/h 0.0140.0 0.01 1 3%0.4 Mph 0.0100 0.01 0.7 3%0.2 Air volume measurement range: CFM: 0999900 ft/min CMM: 0999900m/ min Unit Range Resolution Area CFM(FT/MIN) 0999900 0.001100 0.0019999ft CMM(M/MIN) 0999900 0.001100 0.0019999m Unit conversion: m/s Ft/min Knots Km/h Mph 1m/s 1 196.87 1.944 3.60 2.24 1 ft/min 0.00508 1 0.00987 0.01829 0.01138 1 knot 0.5144 101.27 1 1.8519 1.1523 1km/h 0.2778 54.69 0.54 1 0.6222 1mph 0.4464 87.89 0.8679 1.6071 1 Air temperature: (1) temperature measurement range Unit Range Resolution Accuracy 045 0.1 1.0 32113 0.18 1.8 (2) Humidity measurement range Unit MIN/MAX Resolution Precision Test condition %RH 10-90 0.1 5% 90%RH without condensation Working current: Unit Description MIN/MAX TYP Test condition mA Working current 1: 1520 18 backlight is off mA Working current 2: 2025 23 backlight is on V Low battery indication 3.5 4.5 4 uA Power off current 08 5 Working environment: Temperature 05 (32122) Humidity 4080%RH Storage condition: Temperature -4060(-40140) Humidity 80%RH Power supply: 4x 1.5V AAA alkaline batteries (NOT included) Weight: 1214 g / 42.8 oz(approx.) Package list: 1 * Anemometer 1.The digital multi-function anemometer is a professional instrument for measuring wind speed, temperature, and humidity. 2.It is widely used for wind speed measurement in factory, school, office, traffic, family and many other various occasions. 3.Measuring the wind speed, air volume, temperature and humidity. 4.Measuring wind speed/air volume max/min value function. 5.Wind speed/air volume and temperature unit selection function.packing list:We provide electronic invoice, if you need it, you can send us a message after ordering. However, this invoice cannot be used as a tax invoice, it does not have a company stamp.Observations:If you have any questions during the purchase and use, please contact us first to confirm the cause of the problem.Direct complaints will cause irreparable damage to our shop. Thank you for your understanding and support, we will be happy to serve you.After you receive the product, if you are satisfied with the quality of our products, please do not skimp on your Positive feedback, it is very important to us, thank you very much.#About logistics and transport#All of our products are new! In their original sealed packaging.The official co-operative logistics provider of Mercado platform provides logistics and shipping service for you. They are safe and professional, enthusiastic and efficient service will provide you the products as soon as possible.