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Unlike traditional lasers, these are stackable to create a ray box plus magnetic and hands-free for convenience! Red (635 nm) and Green (532 nm) provide a bright, distinct line. Violet is 405 nm and less visible, making it ideal for discovering properties of wavelengths close to ultra violet, such as fluorescence. Use for a variety of experiments to teach refraction, diffraction, and advanced geometric optics. All 3 include a power output of <5mW. Recommended for Middle School and up.