Electrix Desktop Magnifying Lamp - 3-Diopter - This desktop magnifier features a 3-diopter magnification system that is ready for instant attachment to Models 71210, 71218, 74260, 74265, and 77310. No more squinting and eye strain for those with low vision. Now with this desktop magnifier you can read and view detailed material with comfort and ease. Stop straining and causing more damage to your eyes. Purchase our low vision desktop magnifier today!