Fresnel Lens Magnifier, Diameter 150mm (5.9''), Focal Length 140mm, Acrylic Lens (not Glass), for Physics Classroom Education, Solar Heating, Magnifiying. (Focal Length 140mm) auspowers_batchtwo 5 times longer than that

5 times longer than that of the ordinary cord

free of chemicals

Here at Angels Lab

X-Large and 2X-Large

3 tab (1/3 cut) in assorted positions

Fresnel Lens Magnifier, Diameter 150mm (5.9''), Focal Length 140mm, Acrylic Lens (not Glass), for Physics Classroom Education, Solar Heating, Magnifiying. (Focal Length 140mm) auspowers_batchtwo 5 times longer than thatFresnel Lens Magnifier, Diameter 150mm (5. 9''), Focal Length 140mm, Acrylic Lens (not Glass), for Physics Classroom Education, Solar Heating, Magnifiying. (Focal Length 140mm) Size: ? 150mm Thickness: 2mm Material: PMMA (acrylic) Transmission (%): 92 (from 400 1100nm) Index of Refraction nd : 1. 491 Operating Temperature (C): 80 (Maximum) Product Features 1 Pack Fresnel Lens 150mm Focal length 140mm Thickness: 2mm, Material: PMMA (Acrylic) High Light