Airflow Meter. An airflow meter measures air velocity as well as air pressure. Depending on the type of application, the airflow meter is made as a hot-wire airflow meter, a vane airflow meter, a cup anemometer, a Pitot tube air flow meter or a pocket weather flow meter, all of which can measure air velocity as well as air pressure. Some can even detect the wind direction.
While hemorrhoids can bleed, the amount of actual blood loss is typically slight, so anemia is very uncommon with bleeding hemorrhoids. If you are on blood thinners, such as Aspirin and warfarin, the bleeding might be more impressive, but again anemia would be unexpected.
Hemorrhoids don't always cause symptoms, so you may not realize you have them. Most commonly, you could: Feel discomfort, itching, or pain around your anus. See blood on the toilet paper or in the toilet bowl when you go to the bathroom. Get moist, pink bumps around the edge of or bulging out from your anus (These may look purple or blue, too.)