Name：Manual lensmetr (outer reading)
Model: SY1126
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° step1°
3. Prismatic power range:
Prism diopter of pattern A:0-5prism diopters,1△graduations
Prism diopter of pattern B:0-20△prism diopters,1△graduations(with prism compensation device) 
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
Pattern B (with prism compensation device):5.7KGS
9.Lighting bulb: 220V/110V 15W