The confocalDT IFS 2402 is a series of confocal displacement sensors from Micro-Epsilon that are used for high precision applications. The series of sensors contains an outer diameter that measures 4 mm. It is enclosed in a stainless steel case and is suitable for use within narrow cavities or drill holes.
Furthermore, it has a measuring range of 0.4 up to 1.5 mm, maximum linearity of 0.3 µm, and maximum resolution of 0.016 µm.