STI is involved in the field of environmental and reliability testing. Mechanical environment testing equipment and climatic environment testing equipment are the Group's major products. It is a member of the high-end equipment manufacturing business, specializing in testing machines and opto-mechatronics. It is used to examine the quality and reliability of items used in aerospace, shipbuilding, communications, electronics, automotive, rail transit, and other areas by simulating vibration, shock, drop, temperature, humidity, and other comprehensive environmental conditions.