Transducers Promixity switches also called proximity sensors. Sensor can divided into inductive type capacitive type simulative type. Hall type mgnetic type. Sensor can support using of PLC programmable controller SCM Sr circuit Electronic counters. Solid state relay Small relays and other products. output which have linear relationship changes with the distance So as to achieve the purpose of monitoring. Please contact us with product questions and we will get back to you as soon as possible. We look forward to and appreciate your trust!