1、Measurement of wind speed, air volume and temperature. 2、Wind cold indicator. 3、It has a low battery indicator and data hold function. 4、Switch wind speed units (mph, km/h, m/s, ft/min, knot). 5、Real time measurement of wind speed and average wind speed. 6、Measurement of maximum wind speed and minimum wind speed. 7、Switch between Fahrenheit and Celsius unit. 8、Timed automatic shutdown (automatic shutdown after 10 mins of no button operate). 9、With LED light for easy use in dark environments. 10、Widely used in electric power, meteorology, iron and steel, petrochemical, energy saving and other industries. And it is also suitable for sailing, heating, ventilation, air conditioning, agriculture, sea fishing industry, all kinds of fan manufacturing, the need for exhaust system industry and so on. Specification: Material: ABS Color: black+red Units: CFM, CMM, ℃/℉, mph, km/h, m/s, ft/min, knot Wind velocity measurement: Measurement range: m/s: 0~30 ft/min: 0~5860 knot: 0~55 km/h: 0~90 mph: 0~65 Resolution: m/s: 0.01 ft/min: 1.968 knot: 0.019 km/h: 0.036 mph: 0.022 Threshold: m/s: 0.3 ft/min: 60 knot: 0.6 km/h: 1 mph: 0.7 Accuracy: m/s: ±5%±0.1 ft/min: ±5%±20 knot: ±5%±0.2 km/h: ±5%±0.4 mph: ±5%±0.2 Wind flow range: CMM: 0-999900m³/min CFM: 0-999900ft³/min Range: CFM (FT³/MIN): 0-999900 CMM (M³/MIN): 0-999900 Resolution: CFM (FT³/MIN): 0.001-100 CMM (M³/MIN): 0.001-100 Area: CFM (FT³/MIN): 0.001-9999 CMM (M³/MIN): 0.001-9999 Wind temperature measurement: Measurement range: ℃: -10℃~+45℃ ℉: 14℉~113℉ Resolution: ℃: 0.1 ℉: 0.2 Accuracy: ℃: ±2℃ ℉: ±3.6℉ Battery: 1 * 9V battery (not included) Temperature sensor: negative temperature coefficient resistant Operating temperature: -10℃~+45℃ (14℉~113℉) Operating humidity: less than 90%RH Storage temperature: -10℃~+50℃ (14℉~122℉) Current consumption: about 6mA Item size: 165 * 85 * 39mm / 6.5 * 3.3 * 1.5in Item weight: 148g / 5.2ounce Package size: 175 * 125 * 50mm / 6.9 * 4.9 * 2.0in Package weight: 240g / 8.5ounce 1 * Anemometer 1 * User Manual