Specifications:

1. Range of measurement:  0D to ±20D

     Minimum:   0.125D graduation up 0D to ±5D

                      0.25D graduation over ±5D to ±25D

2. Cylinder axis range: 0~180° step 1°

3. Prismatic power range:

    Prism diopter of pattern A: 0-5 prism diopters                     

4. Prism base angle:

      0 to 180 degree,minimum scale value 1 degree

     180 degree to 360 degree Minimum scale value 5 degree

5. Eyepiece adjustment: ±5D

6. Dimension of objective lens: Φ16 ~ Φ80MM

7. Overall size:27.5(L)*13(W)*45.5(H)(CM)

8. Weight:  Pattern A: 5.6KGS

9. Lighting bulb: 220V/110V 15W