1Pupil distance is adjustable, the adjustable range is 48-80mm. 2Nose pad height and tilt angle are adjustable, user-friendly designs, suitable for most people. 3Up to 4 lenses can be inserted into the left or right frame, you can regulate according to real situation. 4Lightweight designs, reduce the burden of nose bridges when wearing. 5Suitable for visual acuity examination for opticians, hospitals, schools, factories and mining enterprises.Condition: 100% Brand New Item Type: Optical Trial Lens FrameMonocular Movement Range: 25mm-40mm; PD, eye height and ear height can be adjusted Adjustment Rnge of Pupil Distance: Pupil distance of both eyes: 48-80mm, the left or right pupil distance: 24-40mm, minimum scale value: 1mm Axes Scale of Index Plate: Left index plate: 120-0-135; right index plate 45-180-60; the scale of the axial position increases counterclockwise along the axes of frame, and the interval of its marking is 5 Inner Frame Aperture: 32.5mm The Number of Lenses Can be Inserted Into the Left or Right Frame at the Same Time: 4pcs The Degree of Rotation of the Lens around the Optical Axes in Frame: 360 degree The Degree of Non-Parallelism Between the Optical Axes of the Lens and the Geometric Axes of Frame: 2.5 The Difference Between the Optical Center of the Lens and the Geometric Center of Frame: 0.5mm The Displacement of the Lens Relative to the Geometric Center of Frame: 0.3mm Adjustment Range of Nose Pad: Length: 0-14mm; Angle: 0-30 Left or Right Glasses Leg Adjustment Range: 98mm-135mm Maximum Spacing Between Left and Right Glasses Leg: 200mm Net Weight: Approx. 66.3g / 2.3oz }1 x Optical Trial Lens Frame