Product name: Lensmeter(External reading)
1. Range of diopter measurement: From 0D to ±20D
2. Minimum scale value: 0.125D at 0D to ±5D 0.25D at ±5D to ±20D.
3. Astigmatism axis of cylindric lens 0 to 180 degree: minimum scale value 5 degree.
4. Prism base angle: 0 to 180 degree, minimum scale value 5 degree.
5. Regulation of ocular visibility: ±5D
6. Size of lens: 20MM to 80MM
7. Overall dimension of device: 40.5*13*19.5CM
8. Weight: 4KGS
9. Lighting lamp: 220V 3W/110V 3W