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 NewItem Type: Optical Trial Lens Frame Monocular Movement Range: 25mm-40mm; PD, eye height and ear height can be adjustedAdjustment Rnge of Pupil Distance: Pupil distance of both eyes: 48-80mm, the left or right pupil distance: 24-40mm, minimum scale value: 1mmAxes 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 5Inner Frame Aperture: 32.5mmThe Number of Lenses Can be Inserted Into the Left or Right Frame at the Same Time: 4pcsThe Degree of Rotation of the Lens around the Optical Axes in Frame: 360 degreeThe Degree of Non-Parallelism Between the Optical Axes of the Lens and the Geometric Axes of Frame: 2.5The Difference Between the Optical Center of the Lens and the Geometric Center of Frame: 0.5mmThe Displacement of the Lens Relative to the Geometric Center of Frame: 0.3mmAdjustment Range of Nose Pad: Length: 0-14mm; Angle: 0-30Left or Right Glasses Leg Adjustment Range: 98mm-135mmMaximum Spacing Between Left and Right Glasses Leg: 200mmNet Weight: Approx. 66.3g / 2.3oz 1 x Optical Trial Lens Frame