The Festo SOEG-RT-M12-PS-K-2L is a photoelectric sensor from the SOOX series, carrying the order code SOEG-RT-M12-PS-K-2L. It's the part number you'd pull from a BOM for a thru-beam or retro-reflective sensing application in a packaging, material handling, or assembly line — the typical spot where a photoelectric sensor guards a position or detects presence without contact.
The SOEG-RT-M12-PS-K-2L is a current-production part, not a legacy orphan.