HVMLP-Set 4 Premium Replacement Glass Plate Lens set with 4 lenses of varied magnification 1.5x,2x, 2.5x, 3.5x lens with storage case, Hand finished Prismatic Glass lens set with focal length ranging from 20" with the 1.5x to 4" Focal length/working distance with the 3.5x lens. Highly polished Glass lens set these will fit our HVM-3 and HVM-4 models they will also fit OptiVISOR® Brand.
Saw these for a reasonable price for 4 with case, was skeptical but they are as good as optivisor lens plates and you get 4 almost for the price of one and a nice storage case. The set it nice because you have all working distances from 14" to close up 3.5-4". Will buy again. If I have any issues I will re-review.