Parameters:
1. Range of measurement: 0D to ±20D
Minimum: 0.125D (0D to ±5D)
0.25D (±5D to ±25D)
2. Cylinder axis range: 0~180°, 1°/step
3. Prism power range: Pattern A:0-5 prism diopters,1△ graduations
Pattern B:(with prism compensation device) 0-20△ prism diopters,1△ graduations
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. Size of objective lens: Φ16 to Φ80mm
7. Dimension: 27.5*13*45.5cm
8. Weight: Pattern A: 5.6kgs
Pattern B (with prism compensation device):5.7kgs
9. Lighting bulb: Input AC 100V~240V, Output: DC 6V~ 2A 12W
10. DC Power supply is available.