This is an Omron E3F-3L photoelectric sensor, M18 cylindrical body with a 2m cable. Rated for 12-24 VDC and sealed to IP66, it's a current model (lifecycle: current) but offered as a used unit. That means it's a field-removed or surplus part — still the same spec, not new-in-box. The 65 mm length and M18 thread make it a direct replacement for any panel that originally used an E3F-3L. No rewiring needed for a like-for-like swap: same 2m pigtail, same voltage range. Application: general-purpose presence sensing in industrial environments where IP66 is sufficient — wash-down areas, packaging lines, material handling. The diffuse reflective mode (typical for the E3F series) avoids needing a separate reflector or receiver, simplifying installation.
The E3F-3L is still listed as a current production model. This particular unit is sourced as used/surplus — you're buying a functional part that has been previously installed. For a replacement or spare that must match the original BOM line exactly, this is the correct part number.
Mounting: M18 thread, 65 mm barrel length. Cable: 2 m pigtail. Wiring: 12–24 VDC supply across brown (+V) and blue (0V). Output is an open collector NPN or PNP depending on the variant — confirm polarity from the label or original documentation before applying power. IP66: suitable for washdown but not submersion.