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As shown in the description
Versatile Application: Suitable for various laboratory applications
motors and buzzers
Accurate frequency adjustment chrome plated
Diffraction Grating Light Scale As shown in the descriptionThis Diffraction Grating Demonstration Slide has three 20mm x 10mm gratings with 100, 300, and 600 lines per mm, mounted between glass plates. The viewing area of each section is 15mm x 10mm. Three lenses on one slide can be used to demonstrate diffraction of light or to measure wavelengths of light. Premium Quality: Light Scale is made of high grade construction all the way through, excellent build quality and proven reliability across the range.
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