2.5X is recommended for first time users and it is the easiest loupe to adjust to. NORTHOPE loupes provide professional optical glasses, optical filming insuring higher transmittance and anti-reflection coating. High definition optics offers you best resolution, wide field of view and generous depth of field. Meet the requirement of different pupil distance and special function frame for customers who wear optical prescription. Middle and up/down adjustment can provide different wide angle. New fashion design with adjustable spare parts, easy take and more suitable... Why North loupes . Better optics than other brands, clearer and brighter, Better achromatic optics, pure white when see white, Why waterproof . Waterproofing learns from military optics, 1. Easy to clean loupes by water, 2. Full of steam and dust in air, surface of lens is easy to be cleaned, but intra-barrel lens cannot be cleaned,steam and dust can't enter into barrel which is Ar(argon) filled,loupes will be the best optics for the longest lifetime. How To Choose Your Loupes: 1. First select the loupe's magnification. If this is your first time using loupes we suggest you select the lowest magnification that will meet your needs. The lower the magnification, the larger the field of view and the easier the loupes will be to use. 2.5 or 4 magnification is a good starting point. 2. Determine your working distance,working distance is a distance from the wearer's eyes to the visual object,such as a dentist working distance is the distance of the doctor's eyes to the patient's tooth, generally we recommend working distance is 420mm. Warranty We warrant all loupes to be free from defects in material or workmanship under normal use and service for a period of TWO year from the date of delivery. The repairing service is maintaining the whole lifetime of all products. If some parts need to repair, it is free while under warranty.When it out of the warranty, customer just needs to pay for the replacemen
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