| Eyepiece focusing range | +/-5D | 
| The top point diopter measuring range | -25D-+25D | 
| The minimum measuring square value | 0.125D | 
| The shuttle lens measuring range | 18△ | 
| The shuttle lens square value | 1△ | 
| The cylinder lens axial range | 0-180° | 
| The cylinder lens axial square value | 1° | 
| Maximum diameter of measured lenses | 100mm | 
| The Bulb | AC 220V/110V-6V DC3V |