Testo 405i-Hot-wire Anemometer Wireless Smart Probe Measures Air Velocity, Volume Flow, and Temperature,0560 1405. feature: 1. The testo 405i wireless mini hot wire anemometer operated by Testo Smart Probe APP is very suitable for measuring ventilation ducts. This anemometer can be conveniently used to measure air velocity, temperature and volume flow.  2. testo 405i is also very suitable for measuring indoor wind speed. For example, it is very useful for finding non-airtight windows. When combined with testo 605i, it can also calculate cooling capacity and heating output. testo 405i helps you reduce measurement errors  3. Through intelligent equipment, realize the operation independent of the measurement location:  testo 405i is combined with Smart Probe APP. This means that you will be able to benefit from the numerous additional functions of the above instruments in your daily work. With the Testo Smart Probe APP, you can conveniently view the measurement data on your smart phone or tablet, and you no longer need to spend a lot of time analyzing the measurement data obtained from remote measurement points. In addition, the volume flow can be easily measured through this application: you enter the parameters of the pipe cross section, and the application can automatically calculate the corresponding complete result for you.  4. In addition, the application also provides other options: it can not only display measurement data, but also evaluate and record these data. Through this application, you can easily perform timing and multi-point average calculations. You only need to touch a button to display the measurement data curve and send the measurement data record as a PDF or Excel file. specification:  System Requirements:  -IOS8.3 or higher  -Android 4.3 or higher  -Bluetooth 4.0  Product: testo 405i wireless mini hot-wire anemometer, including telescopic probe (length 400 mm), battery and calibration protocol.  NTC parameters  Measuring range: -20 ~ +60 °C  Measurement accuracy: ±0.5 °C  Resolution: 0.1 °C  Hotline parameters  Measuring range: 0 ~ 30 m/s  measurement accuracy:  ±(0.1 m/s + 5% of measured value) (0 ~ 2 m/s)  ±(0.3 m/s + 5% of measured value) (2 ~ 15 m/s)  Resolution: 0.01 m/s parameter  System Requirements:  requires iOS 8.3 or newer; requires Android 4.3 or newer; requires mobile end device with Bluetooth 4.0  Battery type: AAA rechargeable battery  Battery life: 15 hours  Probe sleeve length: 400 mm  Storage temperature: -20 ~ +60 °C  Diameter: 200 x 30 x 41 mm  Operating temperature: -20 ~ +50 °C  Weight: about 0.21KG  Size: 40*10*5cm Package Included:  Battery *1  testo 405i*1