The 5 different interchangeable loupes with different magnifications (from 1x 1.5x 2x 2.5x and 3.5x) will be very practical to always have the right magnification, which allow you to find the best suited to precision work, the lens which can tilt at will allows an optimal orientation to adapt to your needs, in addition, the adjustable lens 180 , and the set with the and the adjustable lens of 90 ATTENTION: the comfort distance is between 25 and 30 cm from the eyes, and the visual field represents at this distance approximately 2 cm high by 6 cm wide, which is more comfortable, in fact it is because as the weight of lens and mount, led and other element, these glasses are certainly not very suitable to read for a long time, but are very suitable for short-term work MORE COMPLETE DESIGN: The loupes themselves are made of plastic, it is an advantage for the weight therefore they are light; besides, 5pcs lenses come in a hard storage box, it is great for find them dust-free when it is time to change them and which allows them to be stored while protecting them from scratches, there is also lighting by two led lamps, the headband LED LAMP AND BAND EQUIPMENT: the LED lamp is only used to illuminate your work area, necessarily small, the lighting by two powerful led lamps gives a clear light to illuminate the part where you want to work, and then it is also sold with a headband for those who wish to keep their eyeglasses while working, or when there is a risk of losing their magnifying glasses during work DAILY MULTI-PURPOSE: magnifying glass is in electronics and model making, the different magnifying glasses that make the writings be zoomed in can find the best suited to precision work, sewing, repairing electronic devices, model makers, watches or precision DIY, reading ect