professional research, development and production of various series of light Curtain sensors, photoelectric sensors, proximity sensors, digital timer, electronic counter and solid state relays for industrial control products has been done more than 30 years in ZONHO ELECTRONICS CO.,LTD. A new generation of products used ASIC circuit and SMT technology, digital technology and European CE standard, and adopting CAD/CAM computer aided design and manufacturing system in strict accordance with international standards, and established a comprehensive quality management system,environment management system and occupational health and safety management system, and has passed ISO9001 international quality management system certification, ISO14001 environmental management system certification and OHSAS18001 certification, ensure the quality and performance of products reach the international advanced level of the same products. All the products by CE certification.