Sphere powers range:
+16.75D to-19.00D, with minimum reading 0.25D or 0.12D(When +0.12D auxiliary lens or optional±0.12D lens is in use)
+26.75D to-29.00D (When optional ±10.00D lens is in use)
Cylinder power range:
0 to-6.00D, with minimum reading 0.25D or 0.12D (when auxiliary lens is in use)
0 to-8.00D (when-2.00D auxiliary lens is in use)
Astigmatic axis scale:
0 to 180° in 5° steps
Cross cylinder:
±0.25D, reversal type (synchronized with astigmatic axis)