Features:
1) Internal reading system;
2) Prism compensation unit included;
3) AC / DC power supply, more convenient.
Specifications:
Eyepiece focusing: 0-±5D
Vertex power: range: 0-±25D (0-±5D, 0.125D steps / ±5D-±25D, 0.25D steps)
Cylinder axis: 0-180Á, 1Á steps
Prism power: 0-20_ (with prism compensator), 1_ steps
Accepted lens diameter: 16-86mm
Power supply: AC110/220V / DC 3V (AA battery x2)