Adjustable focal length -Place the magnifying glass on any object to be viewed. Then rotate the upper part of the magnifying glass until you can clearly see the item. You can move it as needed. The scaled cardinality can also be used to measure itemsize ABS Plastic Material - Made of high quality ABS plastic material with black paint finish.It's quite durable and not easy to damage. This 30x magnifier has a len of 1.1 in diameter,and 3 white light 3 purple UV light.This little magnifier will be a goodhelper at work Wide Application -It is very small and light.You can put it in your bag when you go to the suburbs or the memorial. It's a professional work magnifier,great for printing, handcrafts, watch repairs, reading coins, jewellery, stamps,etc. Easy to Turn On/Off - Just Press down the soft silicone button to turn on the 3 white lights for usual magnified observation, press again to 3 UV lights for money detector magnifier. Press the third time to turn off the light