SiC 精密參考平面，直徑 50 mm。

Used one to verify my interferometer setup and the 50 mm diameter sat perfectly in the mount, no wobble at all. The flatness held up through multiple measurements, which is exactly what I needed for calibration work.

The surface finish is visibly flawless under a bright inspection light, exactly what I needed for calibrating an interferometer setup. It arrived securely packed and the flatness tolerance has already improved my measurement repeatability noticeably.

I’ve been using this 50 mm flat as a reference for calibrating my interferometer setup, and the polish on the SiC surface is incredibly consistent across the whole diameter.