In my opinion this magnifying glass is the perfect "laundry test" size and near perfect design. If it were made of metal instead of plastic, it would probably be the perfect magnifying glass for its function. This is ideal for verifying coins, bills, signatures, postage stamps, small serial numbers, electronic components and small print to name a few. The graduation scale is presented in both millimeters and inches, and both details are very clear. A disadvantage. There is no reason to keep it, you have to keep it safe yourself. It's a simple fix, and for the price, you can't beat this little device.