<b>It can be quite easily used under the following conditions:</b> <br>Operate or read at a dim or dark place; <br>Interesting working such as carving, handcraft and sewing. <br>Assemble or repair small fittings <br>Check the finished product. <p>This magnifier is equipped with <b>a standard detachable light source device</b>. Of course , the angle adjustment is also OK. The small position at hand palm can also be lighted brightly. In addition , when the light source device is unnecessary, you can take out the light source box. which makes this part lighter, and you 'll enjoy your work much more. </p> <p>The Lens assembly parts are added to two :<b> you can also overlap two lenses.</b> You can also use this product even if you wear glasses . The belt size can be adjusted freely.</p>