HB-16&VB-15 Prism Bar

Two pieces a set with a piece of horizontal type and a piece of vertical type, packed with aluminium case.
VB-15: Vertical Diopter: 1,2,3,4,5,6,8,10,12,14,16,18,20,25,30 (total 15 diopters) HB-16: Harizontal Diopter: 1,2,4,6,8,10,12,14,16,18,20,25,30,35,40,45 (total 16 diopters)