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The LumiTest is a light probe designed for use by individuals who are blind or have low vision. This device emits a tone that increases in pitch as light is approached, and when it is in direct contact with materials, lighter colors are indicated by a higher-pitched tone. It can be used to tell whether lights are on, to locate a light source in a room, to tell whether an LED is solid or flashing, to determine whether a page has print on it, or to find the blank space on a letter to write a signature. OPTIONS: Tiny Tip Accessory Pack (pack of 5). WARRANTY: 90-day limited warranty.