Solid Diamond, or Diamond Coated Spheres?
Solid Diamond Spheres
Diamond Coated Spheres
When probing soft alloys, like aluminum, use diamond coated spheres. No buildup occurs when probing or scanning soft materials with diamond coated spheres.
Another advantage of diamond coated spheres is their high Grade 5 (<150 nm) sphericity. They're available in more sizes, and they cost less than solid diamonds.
(Shown: 3.05 mm and 2.05 mm coated diamond spheres)