About A ONE

Since its establishment in 1984 A ONE UNION—under the leadership of General Manager Mr. Tong Eu—has upheld its core values of honesty, mutual support, compassion, and humility. We are committed to delivering professional and reliable products and services. With decades of deep cultivation in the field of temperature sensing and control, our core technologies include the manufacturing of thermocouples, RTDs, compensation cables, and electric heating–related products, enabling us to meet the stringent demands for high reliability and stability across various industries.

In addition to offering standard thermocouple products, we also provide OEM and customized development services. Our goal is to help customers create temperature-sensing solutions tailored to their specific working environments and equipment requirements. With rapid response capability, rigorous quality control processes, stable delivery schedules, and technical support, our team has earned strong trust from customers both in Taiwan and worldwide.

As our business continues to grow and our brand strength expands, we have developed a global customer base and established solid international presence: a manufacturing facility in Guangzhou, China; a branch office in Malaysia; and a joint venture company in South Korea, accelerating our global market deployment and technical collaboration.

Beyond industrial applications, we actively invest in corporate culture and community engagement. In Kelin, Luodong (Yilan, Taiwan), we established the Min Yang 365 Hospitality Center, an 800-ping facility designed as a platform for industry partners to exchange ideas and showcase new technologies. The venue is also open to business groups and community organizations for training programs and team-building activities. We welcome everyone to make reservations and make use of the Min Yang 365 Hospitality Center.

Our main products include:
Thermocouples, thermocouple junction boxes, terminal blocks, RTDs, SCR phase controllers, temperature transmitters, temperature probes, compensation cables, stainless steel protection tubes, electric heating tubes, as well as a wide range of accessories and OEM customization services—providing customers with a complete one-stop solution.