Air gap sensor SOPA-M1-R1-HQ6-2N-M12 For contactless distance sensing. Authorisation=(* RCM Mark, * c UL us - Recognized (OL)), CE mark (see declaration of conformity)=to EU directive for EMC, Materials note=(* Free of copper and PTFE, * Conforms to RoHS), Measuring principle=pneumatic, Sensing range=20 - 200 ?m