Testo 0560 4101 410 1 anemometer testo 0560 4101 p the 410 1 anemometer from testo is ideal for fast check measurements while being small enough to fit in your pocket with a measuring range of 0 4 to 20m s the anemometer can even be used for low flow speeds it has a permanently mounted vane with a diameter of 40mm so can be used for the integral measurement of air velocity at ventilation grilles p p it is also ideal for outdoor operation as well as air velocity and air temperature t