Features Light weight tiny size with simple one-hand operation Will sense airflow as low as 0.4 m/s with an accuracy of ±3% (4%>20m/s) Replaceable snap-in anemometer vane All models feature min/max hold a backlight and come complete with a wrist strap carry pouch and button cell battery providing at least 40 hours of continuous use. Dimension - 4.75 x 0.75 x 1.75 in. Item Weight - 0.125 lbs. - SKU: SPRCT050