Front mounting style
Multipurpose Wood Rulers: These rulers for school are perfect for office
perfectly match with the human curve
6''(83 x 83 x 93 mm) Item Weight: 8
Increased depth of field and reduced glare
Fresnel Lens 150x150mm, Focal Length 140mm, Acrylic Lens (not Glass), for Solar Heating, Magnifiying, Optics/Visual Education sold2025 Front mounting styleFresnel Lens 150x150mm, Focal Length 140mm, Acrylic Lens (not Glass), for Solar Heating, Magnifiying, Optics Visual Education Size: 150x150mm, Focal length 140mm, Thickness: 2mm Material: PMMA (acrylic) Groove pitch: 0. 5mm Transmission (%): 92 (from 400 1100nm) Index of Refraction nd : 1. 491 Operating Temperature (C): 80 (Maximum) Product Features 1 Pack Square Fresnel Lens Magnifier 150x150mm, Focal length 140mm, Thickness: 2mm, Material: PMMA