an acrylic horizontal prism bar (1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40 dpts and an additional prism of 45 dpts) an acrylic vertical prism bar (1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25 dpts ).

• thumb_up 2 Interest
• eye_tracking 10 View
• bookmark Saved
• share Share