Light meters devices are used in a wide array of disciplines, but most often, there are still individuals in these fields who have no clue how light meters' work, or why they're necessary. A light meter is merely a light measuring device. This toll features two circuits, the analog, and digital circuits, which are responsible for helping a photographer or videographer determine the f-number and shutter speed they need to experience an optimum exposure, with given film speed and lighting situation. A light meter works in a scene by measuring the amount of light available, and this measurement is a very vital piece of information, needed in fields such as cinema and photography. These devices are so versatile, and they can be used in other areas such as schools, offices, backyard gardens and factories.\r