Specification Brand : Songzi Optics BulletPoint1 : 3.5X loupes specification:Field Of View:100mm.Depth of field: 100mm. Titanium Frame BulletPoint2 : 3 kinds of working distance : R(360 - 460 mm), L(440 - 540 mm), XL(500 - 600 mm). BulletPoint3 : How To Choose Your Loupes Determine your working distance, While working on a friend or family member have someone measure the distance from your eyes to your patient's : this is you working distance. Choose the distance that is closest to the selection we offer. IF you are a dentist , your height is in the range from 160cm to 180CM,we recommend R(360-460mm) or L(440-540mm) working distance. BulletPoint4 : IF you're a surgeon, you are sitting while working, your height is from 160cm to180cm, we recommend working distance L(440-540mm) .IF you are standing while working, your height is from 170cm to 180cm, XL(500-600mm) working distance will be fit for your work. Color : Magnification:3.5X FdaDeviceClassification : i FdaIndicationOfUse : otc_and_rx FdaInstructionsForUseType : consumer FdaLabelType : consumer ItemName : Songzi Optics 3.5X Half Frame Ergonomic Dental Loupes Surgical Loupes No Need to Bend Head (Working Distance: XL(500-600mm), Magnification:3.5X) ItemTypeKeyword : professional-dental-and-surgical-loupes Manufacturer : Songzi Optical Co.,Ltd ModelName : SZERGO2 ModelNumber : SZERGO2 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : SZERGO2 ProductDescription : Songzi Optics SZERGO 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,By cringing your patients closer,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.Custom Manufactured to Your Unique Measurements.Including angle of declination and working distance, providing you with the best visual and ergonomic system available. ProductSiteLaunchDate : 2012-10-08T04:00:00.000Z Size : Working Distance: XL(500-600mm) UnitCount : 1 UnspscCode : 42000000