Probe cast iron surfaces without worrying about abrasive damage to your workpiece or stylus. These styli have a zirconia ceramic ball end, which minimizes friction on cast iron better than other stylus materials, such as ruby. When they touch a workpiece, they trigger your coordinate measuring machine (CMM) probe to send a signal and measure geometric features. The ball end is completely round to keep from touching your workpiece at more than one precise point, preventing inaccurate measurements. As a rule of thumb, you should use a stylus with the largest ball end diameter that works for your application. Larger ball ends minimize the risk that the stem will accidentally touch your workpiece and interfere with the reading.

Tungsten carbide stems are the stiffest and least likely to flex. Tungsten carbide slightly expands in changing temperatures, so if you need precise measurements, use these styli in temperature-controlled environments.

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