Numerous different circuits are created around the world on a daily basis, making it rather difficult for circuit designers to stay abreast of the latest developments. In an attempt to keep up with ...

How CR Tests Air Conditioners Consumer Reports uses a sound meter to test air conditioner noise levels on both high and low settings, which provides an objective volume measurement.

Stay up-to-date with the latest science and technology news from Daily Mail including scientific discoveries, pictures, new technology, and more.