Specification Brand : EISCO BulletPoint : Weight:16g Size:30*20*4MM BulletPoint1 : Pair of glass plate, optically polished BulletPoint2 : 60mm diameter BulletPoint3 : Heavy duty metal frame BulletPoint4 : Pressure adjustable by three metal screws BulletPoint5 : Educational Value: Ideal for educational purposes, providing a unique way to discuss and learn about significant historical events and their impact. Color : S ExternallyAssignedProductIdentifier1 : 0849230044442 ExternallyAssignedProductIdentifier2 : 00849230044442 ExternallyAssignedProductIdentifier3 : 849230044442 ItemName : Eisco Labs 3" Metal Frame Newton's Ring Apparatus ItemPackageDimensions_Height : 6.604 centimeters ItemPackageDimensions_Length : 11.684 centimeters ItemPackageDimensions_Width : 10.668 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-classroom-optics-kits Manufacturer : EISCO Material : Metal / Glass ModelName : TC374 ModelNumber : PH0584 NumberOfItems : 1 PartNumber : PH0584 ProductDescription : This Newton's Ring Apparatus. 3" frame is made with heavy duty metal with metal screws. Pair of glass plates, glass is optically polished, glass is 60mm diameter, one glass plate is plain, the other glass is a plano-convex. Both are mounted together in the frame. Pressure between plates adjustable by three metal screws. ProductSiteLaunchDate : 2014-01-31T21:55:24.803Z SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnspscCode : 41000000 WarrantyDescription : A