High class glass with Large size aperture φ150mm are used for all machine types.Lens magnification・・・2×,3×,4×exchangeable.Illumination Iump・・・FCL30W Circular fluorescent lamp.日本OTSUKA大冢放大镜 技术参数:・Aperture lens 150mm・Arm dimensions 1,000mm・possible attachable width 60mm・Magnification:×2 ×3 ×4