CARSON LumiLoupe Plus 17.5x Focusable Loupe - Plastic Lenses (includes Tuning tips sheet)This is one of the best moderately priced magnifiers for looking a fountain pen nibs and the model we use for checking fountain pen nibs. Two optical quality plastic lenses that give sufficient magnification and field of view to obtain a clear image of the your fountain pen nibs. The clear acrylic skirt allows light in and also shows you the focal plane of the magnifier so you know where to place the nib for the clearest view. When checking tine