The Balluff BOS0178 (BOS 23K-PU-RH10-S4) is a high-precision photoelectric diffuse sensor with background suppression, ideal for reliable object detection in industrial automation. Featuring a compact cubic design (23 × 51 × 52.4 mm), it operates on a triangulation principle with a focused red LED beam and a detection range of 3 to 800 mm. Its PNP NO/NC output and selectable light-on/dark-on input function ensure flexible integration, while the rugged washdown-capable housing (PC/ABS with PMMA sensing surface) and IP67 rating provide durability in harsh environments. With an M12 4-pin connector and 10–30 VDC operating voltage, the BOS0178 delivers consistent performance across diverse applications.