1. Material: metal, plastic
2. Uses: It is suitable for visual inspection in optical shops, hospitals, ophthalmology departments, schools, factories and mines.
3. Features: The movement range of a single eye is 25mm to 40mm, and the height of the eyes and ears can be adjusted.

parameter:
1. The adjustment range of the interpupillary distance: the interpupillary distance between the eyes is 48-80mm, the left or right interpupillary distance is 24-40mm, and the minimum scale value is 1mm;
2. The axis scale of the indexing plate: the left indexing plate is 120 degrees to 0 degrees to 135 degrees; the right indexing plate is 45 degrees to 180 degrees to 60 degrees; The interval is 5 degrees;
3. The inner aperture of the frame: 32.5mm in diameter;
4. The number of lenses that can be inserted into the left or right frame at the same time: 4;
5. The degree of rotation of the lens around the optical axis in the frame: 360 degrees;
6. The non-parallelism between the optical axis of the lens and the geometric axis of the frame: less than or equal to 2.5 degrees;
7. The misalignment between the optical center of the lens and the geometric center of the frame: less than or equal to 0.5mm;
8. The displacement of the lens relative to the geometric center of the frame: less than or equal to 0.3mm;
9. Adjustable range of nose pads: Length: 0～14mm; Angle: 0°～30°;
10. Left or right temple length adjustment range: 98mm～135mm;
11. The maximum distance between left and right mirror feet: 200mm;