<ul><li>Size: 400x300mm; Focal Length:300mm 330mm 510mm 600mm for your choosing; Thread Distance: 0.3mm; Thickness: 2mm.</li><li>Transmittance: 92%; Magnification 3x. This Fresnel Lens can be used on DIY Projector,Plane Magnifier,solar concentrator.</li><li>Professional and practical design with beautiful appearance, easy to carry and use.</li><li>Usually used in laboratories, schools, teachers, sample observation, eyepiece protection, etc.</li></ul><br><br>

Microscope Accessories Kit Large 400x300mm Optical Solar Fresnel Lens Focal Length Projector Plane Magnifier,Solar Cncentrator Lens 1PC Microscope Slides (Size : 400x300mm, Color : 510mm)