Specifications:
1. Range of measurement: 0 to ±20 D
Minimum: 0.125D graduation up 0 to ±5D
0.25D graduations over ±5D to ±25D
2. Cylinder axis range: 0~180 step 1°
3. Prism diopter: 0-20△ prism diopters 1△ graduations
4. Prism base angle: 0~180° minimum scale value 1°
180°~360° minimum scale value 5°
5. Eyepiece adjustment: ±5D
6. Dimension of objective lens: Φ16~Φ80MM
7. Overall size: 22.6*15*39(CM) (L*W*H)
8. Weight:4.3KGS
9. Lighting bulb: 220V/110V 15W