• We offer returns or exchange service for items within 30 days of receipt of shipment.We offer USA return address.If buyer wanted to return or exchange items,please email us for exchange service process.
• 2.5X specification:Field Of View: 100-110mm,Viewing Angle: 20-150°.Depth of field: 100mm.3X loupes specification:Field Of View: 75-85mm. Viewing Angle: 20-150°,Depth of field:90mm.
• 3.5X loupes specification:Field Of View:60-65mm. Viewing Angle: 20-150°.Depth of field: 80mm.LED headlight High intensity:15000-30000Lux, Continuous run-time:4 hours,Battery pack weight:100g, LED bulb:1 W,Charge voltage:AC110V-240V/50-60Hz.
• 4 kinds of working distance : S(280 - 380 mm), R(360 - 460 mm), L(440 - 540 mm), XL(500 - 600 mm).How To Choose Your Loupes Determine your working distance, which will also automatically determine your field of view. While working on a friend or family member have someone measure the distance from your eyes to your friend's mouth or body: this is you working distance.
• Choose the distance that is closest to the selection we offer.If you are sitting while working, your height is from 160cm to180cm, we recommend working distance R (360-460mm ). IF you are standing while working, your height is from 170cm to 180cm, we recommend L (440-540mm) working distance, even XL(500-600mm) working distance will be suitable.

• Is Discontinued By Manufacturer ‏ : ‎ No
• Date First Available ‏ : ‎ March 13, 2015
• Manufacturer ‏ : ‎ Songzi Optical Co., Ltd