1. Method of measurement: Cornea reflection light coincidence method

2. Range of measurement: 44~82mm(both eyes), 22~41mm(each type)

3. Graduation: 0.5mm

4. Range of focusing point: 30cm to infinity

5. Auto-off time: 1 minute

6. Power source: DC 4.2V

7. Size: 310*230*110mm

8. Weight: 0.8kg