Specification BinocularPrismDescription : Roof Prism Brand : Songzi Optics BulletPoint1 : 2.5X Loupes Field Of View: 150mm,Depth of field: 280mm, Working Distance 350mm -550mm,Weight: 45g. BulletPoint2 : 3X Loupes Field Of View: 140mm. Depth of field:200mm ,Working Distance 350mm -550mm,Weight: 50g. BulletPoint3 : 3.5X Loupes Field Of View:130mm.Depth of field: 200mm,Working Distance 350mm -550mm,Weight: 55g BulletPoint4 : Buyer can use PDCheck AR APP on phone, and save PD data screenshot, there are Far PD and Near PD. If you are a dentist, you need to choose Far PD, but need to reduce 4mm, for example Far PD is 66mm, that mean dental working distance Near PD should be 62mm, then you need to choose 62mm Near PD variation when place order. If you are a surgeon, you can use the APP Near PD data directly. BulletPoint5 : If your Near Pupil distance is not included into loupes variations, please choose Other Near PD, and leave your Near interpupillary distance in the message and we will customize it according to your size. BulletPoint6 : Buyer can use PDCheck AR APP on phone, and save PD data screenshot, there are Far PD and Near PD. you need to choose Near PD variation when place order Color : Other Near Pd DiopterAdjustRangeDescription : +/-5 diopters ExternallyAssignedProductIdentifier1 : 758358708832 ExternallyAssignedProductIdentifier2 : 0758358708832 EyeRelief : 12 millimeters FdaDeviceClassification : i FdaIndicationOfUse : otc_and_rx FdaInstructionsForUseType : consumer FdaLabelType : consumer ItemName : 2.5X 3X 3.5X Optional Songzi Optics Metal Frame Customized TTL Dental Surgical Loupes with Headlight Wide Field of View (Magnification:2.5X, Other Near Pd) ItemPackageDimensions_Height : 16 centimeters ItemPackageDimensions_Length : 23 centimeters ItemPackageDimensions_Width : 13 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : professional-dental-and-surgical-loupes MagnificationMaximum : 3.5 multiplier_x MagnificationStrength : 2.5 multiplier_x Manufacturer : Songzi Optical Co.,Ltd Material : Plastic ModelName : SZTTL ModelNumber : SZTTL253035 NumberOfBoxes : 1 NumberOfItems : 1 NumberOfLithiumIonCells : 1 OpticalZoom : 3.5 multiplier_x PartNumber : SZTTLTT ProductDescription : Songzi Optics SZTTL series has long working distance, Wide Field Of View,very comfortable to work with. LED illumination system are available.Multi-layer anti-reflection coating provides extremely high resolution.Anti-glare, scratch-resistance optic lens ensure long time no-trouble use. Helping to reduce eyestrain.You can improve your posture and avoid stooping. Multiple magnification levels loupes offer performance matched to your requirements.Multiple magnification levels enable you to see more,spot problem earlier and offer even higher levels of precision treatment. Exclusive Telescope Design with Precision Coated Optics for the best possible vision through the lens. Warm Tipes: Buyer can use PDCheck AR APP on phone, and save PD data screenshot, there are Far PD and Near PD. If you are a dentist, you need to choose Far PD, but need to reduce 4mm, for example Far PD is 66mm, that mean dental working distance Near PD should be 62mm, then you need to choose 62mm Near PD variation when place order. If you are a surgeon, you can use the APP Near PD data directly.If your Near Pupil distance is not included into loupes variations, please choose Other Near PD, and leave your Near interpupillary distance in the message and we will customize it according to your size. ProductSiteLaunchDate : 2012-10-09T01:00:00.000Z RequiredProductComplianceCertificate : No Size : Magnification:2.5X SizeMap : Compact SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 42000000 ZoomRatio : 2.5X or 3.5X