Testo 0560 4102 410 2 anemometer testo 0560 4102 p the 410 2 anemometer from testo is an upgraded version of the 410 1 order code a href https www rapidonline com 57 4171 57 4171 a and allows the measurement of humidity levels as well as measurements of air flow velocity and temperature it is ideal for fast check measurements at ventilation grilles and outdoors with the permanently installed vane diameter 40mm you can even measure low air velocities from 0 4m s to 20m s p p