AZ89191 AZ-89191 Bluetooth-compatible Air Flow Velocity Volume and Temperature Wind Speed Measures Meter Range 0.20~30.00 M/S    Features:     AZ 89191 Wind Speed Meter for Android & IOS * Measures air velocity, volume, temperature, humidity, dew point & wet bulb temperature and CO2 * Broadcasting data every second to smart devices by using Bluetooth technology * 10 cm diameter vane type with build in temperature, humidity and NDIR CO2 sensor * Auto airflow cone recognize * Optional square & round flow cone and extension stick * Unlimited points average auto calculation * Time weighted average auto calculation * Free APP provides data recording, photograph & filing * Please search for “Nice Flow” from APP stores      Application:     Application of 89191 AZ Bluetooth 4.0 Air Flow Measuring Devices:    The 89191 AZ Bluetooth 4.0 wind speed metercan measure the Air Speed, Air Velocity, Air Volume, Temperature, Humidity value, which is the best   choice as the wind speed monitoring device in HVAC (Heating, Ventilation, Air Conditioning and Refrigerating) or industrial related application. The portable 89191 AZ Bluetooth4.0 Air flow Meterhas the 10 cm diameter vane type with built-in NDIR wave guide technology CO2 sensor, it can   measure the CO2 value to monitor the indoor air quality. The 89191 AZ Bluetooth4.0 Anemometeris very easy to use. It could export the data through Bluetooth 4.0 wireless technology to User's smart phones   via “Nice Flow” APP. Welcome to learn more about the operation procedures from the YouTube linkage in the end of page. The 89191 AZ Temperature & Relative Humidity & CO2 & Air Flow Metercould attach to the specific air flow cone to measure the volume quickly.   User just needs to install the compatible airflow cone, the meter will recognize the area for air volume calculations automatically. The air flow cone set   has the round and square size, which could be met with most applications. We also provide the cone extension stick could be purchased, which could   let user another way to take measurement in an efficient way without using ladder.          Specification:           Model     89191           Wind Speed Range     0.20~30.00 m/s           Wind Speed Accuracy     ±(1.5% of reading+0.3 m/s) for under 20 m/s ±(3% of reading+0.3 m/s) for above 20 m/s           Air Temperature Range     -20~60& 8451;           Air Temperature Resolution     0.1& 8451;, 0.1& 8457;           Air Temperature Accuracy     ±0.6& 8451;           Air RH% Range     0.1%~99.9%RH           Air RH% Resolution     0.