Specification Brand : Huanyu BulletPoint1 : Efficient optometry: colored plastic rings available in red, black, and white colors for easy classification and quick identification of lens types or degrees. Detachable tray, easy to place in the drawer of the optometry combination table. The tray is labeled with lens power and the handle has photometric markings, making it easy to use and check BulletPoint2 : Professional lens matching - wide testing range: equipped with 266pcs lenses, with a light aperture of 26mm and an outer diameter of 38mm, including 6 types of concave/convex spherical lenses, concave/convex cylindrical lenses, prism lenses, and auxiliary lenses, with complete types and degrees, meeting the various needs of lens testing in eyewear stores BulletPoint3 : Professional lens matching - precise testing: The lenses are made of high-quality optical glass, with high transmittance and clear axial position. The accuracy of 0.25D can help you accurately test patients' refractive errors. Assist customers in selecting a more suitable pair of glasses BulletPoint4 : Design details: The plastic ring that is not easily deformed is more lightweight and comfortable to wear, and the material is soft, not easy to scratch or wear the lens, with a longer service life. Just right spacing: easy to insert and remove lenses, standard slots effectively protect lenses. The axis markings of the prism and cylindrical lenses are directly engraved on the mirror surface, which is not prone to axial changes BulletPoint5 : Aluminum metal outer box: sturdy and durable, wear-resistant and scratch resistant, moderate weight, easy to carry. And it is easy to clean and maintain, and does not look old even after long-term use. Equipped with a password lock, you can set your own password for more secure storage BulletPoint6 : Widely applicable: It is very suitable for optometrists, vision testers, and families to check patients' refractive errors. And suitable for scientific research institutions or optometry education and training, as an experimental tool and teaching equipment. It can also be used as a portable device in mobile optometry or home services, providing optometry services for customers who cannot come to the store Color : Double Injection ExternallyAssignedProductIdentifier1 : 0755462574094 ExternallyAssignedProductIdentifier2 : 755462574094 FocalLengthDescription : 100 mm FocusType : Fixed Focus GpsrSafetyAttestation : 1 IncludedComponents : 1pc IncludedComponents1 : lens IncludedComponents2 : trial frame IncludedComponents3 : box ItemDisplayDimensions_Length : 1.57 inches ItemDisplayWeight : 0.06 pounds ItemForm : Cube ItemName : Huanyu Optical Trial Lens Set Kit Optometry Glasses 266pcs Plastic Rim Circle with Eye Testing Frame Aluminum Suitcase Box for Optometrists, Students, Clinics ItemPackageDimensions_Height : 3.95 inches ItemPackageDimensions_Length : 22.24 inches ItemPackageDimensions_Width : 16.14 inches ItemPackageQuantity : 1 ItemShape : Square ItemTypeKeyword : science-classroom-optics-kits ItemVolume : 16 cubic_centimeters LensDesign : Prime Manufacturer : Huanyu Material : Glass MaxFocalLength : 100 millimeters MinFocalLength : 100 millimeters ModelName : Plastic Rim-266Pcs ModelNumber : PR-266 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : QLW-201-HY ProductDescription : Standard packing number: 266pcs Application: optometry Comes with the box: Glasses cloth * 1, Occluder* 1, Indicator stick * 1, Trial frame * 1,