Double Convex Lens, Highly polished, optically true lens is excellent for physics classroom demonstrations in optics and light refraction, with ground edges, great for physics classrooms, with highest grade, Size: 500mm focal length, Lens measures 3in diameter, 0.1 weight
AquaClear 20 Zeo-Carb Filter Insert effectively eliminates odors, discoloration and impurities in freshwater aquariums, potent chemical duo prevents the buildup of toxic ammonia and nitrite, designed for Power Fil
AquaClear 50 Zeo-Carb Filter Insert effectively eliminates odors, discoloration and impurities in freshwater aquariums, potent chemical duo prevents the buildup of toxic ammonia and nitrite, designed for Power Fil
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