The Panasonic SUNX FX-300 series digital fiber sensor represents a significant advancement in sensing technology. Designed for stable and reliable performance, it incorporates a four-chemical emitting element to minimize light emission changes over time and a control circuit to manage short-term fluctuations. The sensor’s double coupling lens increases emission efficiency, resulting in a 50% increase in sensing range compared to previous models, particularly beneficial for miniaturized applications. Features include light-emitting amount selection for improved detection of transparent or minute objects, an ultra-high-speed response (35 µs for FX-301-HS), and a large 4-digit display for precise threshold setting. Applications include detecting the presence or absence of labels and ICs, and enabling differential sensing for small object detection.