Spectrum Inspections Systems Ltd

HB OPTICAL is a leading design and manufacturer of precision optical filters and reflectors in China.Our mission is to become a world-class R & D and production base of precision optical interference filter and reflector products. Contribute to the s

Welch is a leading provider of high-quality, durable vacuum pumps. Our extensive portfolio includes diaphragm, rotary vane, and turbomolecular pumps and systems, plus accessories. As a global leader in vacuum technology, our customers include labora