Coaxial light source uses high-power patch lamp beads densely arranged, higher brightness, special coating of spectroscope, reduce light loss, eliminate the acquisition of images and reflections, special optical material concentrating, uniformity and consistency, scientific heat dissipation design, fully ensure the service life of the product. Application range of scratches and indentation detection of highly reflective surfaces; Mobile phone cover glass surface defect detection; Metal plate surface detection; PCB board guide positioning.