Abstract: An anemometer, in which a preferably cylindrical flow-capturing surface (1) is fastened to the control lever (10) of an electrical transducer (2) which is fixed to the top of a support (16) mounted in a box (15). The flow-capturing surface (1) is fastened to a cylindrical hollow body (18) arranged in an annular chamber (19) which surrounds the electrical transducer (2) and the support (16) thereof. The upper part of the cylindrical body (18) is passed through an opening (315) formed in the upper wall (115) of the box and sealingly closed by a resilient annular collar (14) fixed to the cylindrical hollow body (18) and to the upper wall (115) of the box (15). The flow-capturing surface (1) is protected by a covering disc (23) fastened to the upper wall (115) of the box (15) by spaced thin rods (24).