GuDoQi Magnifying Glasses with Light for Close Work, 4 Interchangeable Lens (10X, 15X, 20X, 25X), Jewelers Loupe, Hands Free Reading Magnifying Glass for Watch Repair

Single Eye Observation: Considering its character of area observation, it is suggested to observe with one eye. It can't focus when you use two eyes lens at the same time Focal Length: The higher magnification is, the shorter focal length will be. Adjust focal length from 0.2 to 1.8 inch (0.5-4.6cm) by changing different lens Replaceable Lens: 4 Pairs of lens with different magnifications (10X, 15X, 20X, 25X) are included. For a larger grand review please refer to lower magnification Humanized Design: With adjustable LED light, it can help you work in the low-light. Detachable bracket and headband ensure tight wearing and reduce fatigue Wide Using and Note: It can be used in mechanical processing, electronic repair, jewelry appraisal, timepieces repair and miniature engraving etc,not fit for who want to repaire less than 0.05inch precision Mechanical watches or dentist magnifier