This heading captures compound optical microscopes that are neither stereoscopic (9011.10) nor specifically designed for photomicrography or microprojection (9011.20). In practice, it includes most standard upright and inverted brightfield, phase-contrast, and fluorescence microscopes used in clinical, educational, and general research settings, provided they lack the specialized imaging configurations that would place them in 9011.20.

Origin is determined by where substantial transformation occurred. For complex optical instruments, this typically means the country where the optical body, objective lenses, and mechanical stage are assembled and calibrated. A manufacturer's certificate of origin, bill of materials identifying where key components were produced, and production records are the standard supporting documents. If components from multiple countries are involved, a customs broker can help apply the applicable origin rules.