In lasers, the ratio between the actual focal point diameter and a theoretically perfect focal point diameter, usually expressed as a unitless value, M2, with the best value being 1.00; real-world values range from about 1.1 to 1.5.
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Norton Introduces All New Norton Gemini RightCut Wheels as Best Aluminum Oxide (A/O) Solution for Steel and Ferrous Metals. Norton Gemini RightCut Wheels are Thinner, Faster & Stronger.
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