Features:
-Economic manual lensometer
-Internal reading system
-Prism compensation unit included
-AC/DC powered,very convenient to use
Specifications:
-Type:Internal readingsystem
-Eyepiece focusing: 0-±5D
-Vertex power: range: 0-±25D, 0.125D steps for 0 to ±5D, 0.25D for ±5D to ±25D
-Cylinder axis: 0-180Á, 1Á steps
-Prism power: 0-20_ (with prism compensator), 1_ steps
-Accepted lens diameter: 16-86mm
-Power supply: AC /DC (AA battery x2)