. The importance in being connected to the computer is that it is through the computer system that the calculation is effective and can illuminate the indicator lights whenever needed. Whenever there is a higher or lower than normal flow in the tube, warning lights are flashed. Also, when there is malfunction or clogging in the flow meter, a light also would illuminate. Another function of the meter device is to regulate the flow by adjusting the valves, and then provide feedback about the inner functions of the engines of the vehicles. Some laboratories would also use the air flow meter for various experiments. Several modern cars of today are built in with mass air flow meters that will give a clear data after flow measurement. Meters today are sold in a variety of features and different prices. Some are produced for specific purposes and some can be used for generic reasons. The delicate fixtures are present in these meters that are made to give higher efficiency and sensitivity. Air flow meter device comes in various sizes and so it is important to choose the size according to the need. The calibration of the device should be verified to ensure that you will have an accurate reading. Other various kinds of important flow meters are available. There are meters that can be used to measure the amount of water consumed in both industrial and domestic uses, categorized into the velocity meter and the positive displacement meter. For domestic uses, the positive displacement meter would be the choice, while huge commercial centers and industries would use the velocity meters.