Small and lightweight, Western’s Manual Lensmeter with external scale, provides economical performance. The distinctive european dot target provides a highly sensitive, accurate reading. Vertex power range 0.00D to +/-10.00D in 0.25D steps, and from +/-10.00D to +/-25.00D in 0.50D steps. Axis range 0 to 180 deg. in 5 deg. steps. Prismatic power range 0 to 5 deg. 1 deg steps. Max lens diameter 80mm. Tilt range from base 30 to 90.