Rigid Fresnel
This is a Rigid Fresnel magnifier. Can be used for a variety of appliactions : solar energy collection, hot water heater, fire starter.
Size: 150mm x 90mm (6" x 3.5") Thickness: 2 mm Material: optical acrylic Groove pitch: 0.5mm Focal length: 185mm Magnification: 3x
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Price: £4.95