Retro-reflective sensor SOEG-RSP-Q50-NA-S-3L With polarised light, block design Design=Block design, Conforms to standard=EN 60947-5-2, Authorisation=(* C-Tick, * c UL us - Listed (OL)), CE mark (see declaration of conformity)=(* to EU directive for EMC, * to EU directive low-voltage devices), Materials note=Free of copper and PTFE