Reflective surfaces on precision spheres can cause problems in some applications, such as laser measurement. Goodfellow offers precision spheres with matte surface finishes in a range of materials—alumina, ruby, sapphire, silicon nitride, zirconia, and others—in diameters from 0.15 mm to 20 mm, and up to 150 mm as a special order. Tolerances range from ±0.5 to ±10 µm and sphericity from 0.075 to 2.500 µm. Most are AFBMA Grade 25 but the company can generally supply AFBMA Grade 3 up to Grade 200. Also offered are precision spheres with drilled holes for mounting on a spigot, and with a spigot, if required. Goodfellow Cambridge Limited
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