The photo indicators represent a different type and size of display with outputs, on which, by means of electrical signals, they can visualize different information or indicator activity depending on the stage of completion of a given work. They are light indicators that, depending on the application and the need, can be specialized and limited and visualize numbers, letters, or indicator divisions in different colors, as well as liquid crystal or dot matrices that have the possibility, depending on the input data, to present a different kind of information.
Light indicators are widely used in electronics and are an indispensable part of the assembly of various electrical appliances, devices and tools. They have solder terminals and can be built into various appliances such as timers and temperature indicators in microwaves, washing machines, ovens, electronic clocks, thermometers and hygrometers, as well as being indicator displays for various construction power tools showing the battery level, indication of loading and others.