Testo 0560 1405 405i smartprobe bluetooth thermal anemometer testo 0560 1405 p the testo 405i hot wire thermal anemometer with smartphone operation is ideal for carrying out measuring tasks in ventilation ducts it is easy to use the anemometer to determine air velocity temperature and volume flows the testo 405i is also suitable for measuring indoor air velocity practical when for example you want to locate non airtight windows p p with the testo smart probes app you can view readi