Zhang Heng's Seismoscope

Last updated 2026-11-09 — The Zhang Heng Seismoscope series of products is supervised by the Geophysical Exploration Center of China Earthquake Administration and the Nanyang Zhang Heng Research Association of China, and manufactured by the Four Sages Science & Culture Communication Service Center in Nanyang, China. It features seismographic demonstration functions and comes in 12 models (large, medium, and small). Phone: 0377--6…