https://pure.seoultech.ac.kr/en/publications/shape-recognition-of-a-bga-ball-using-ring-illumination/
Shape recognition of a BGA ball using ring illumination - Seoul National University of Science &...
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https://lifesciencemarket.com/en/kern-sohn-ring-illumination-ozb-a4571.html
Lifesciencemarket.com KERN & SOHN | Ring Illumination OZB-A4571
Professional lighting units for outstanding, uniform, and strong illumination. Technical data: Illuminance 4W, ring illumination diameter 6.1 cm, color...
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https://www.keyence.co.uk/products/microscope/digital-microscope/vhx-700f/models/op-72402/
Ring Illumination Standard Light for VH-Z100 - OP-72402 | KEYENCE UK & Ireland
OP-72402, Ring Illumination Standard Light for VH-Z100, VHX-700F series, KEYENCE, UK
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