Accurate air velocity meter to measure air temperature and velocity with calculation of volume of air current and RS-232 interface for data transfer to a computer, software and cable is included. This air velocity meter has a good relation between price and quality and it combines accuracy and versatility with the ability to transfer data directly to a computer. This air velocity meter forms a part of a professional's basic equipment to regulate and test ventilation systems. It air velocity meter is also used in research and development projects within institutions. Its fine 8 mm / .3 in point makes it possible to use in areas here there is limited space to measure, such as cooling systems. When a surface area is input into the air velocity meter, it will calculate the volume of air current in m³/min. In this way, the capacity of a ventilation can be controlled and it can be used for air conditioning and refrigeration systems. It should be taken into account that when measuring air flow, various measurements should be taken and the average used to represent the air flow reading.