How to use: Simply place this magnifier lens into your welding helmet. It's designed to fit most models, so you should have no trouble installing it. When you start welding, the lens will help you see the workpiece clearly. Attention: Don't use it in extremely high - temperature environments beyond its tolerance. Avoid dropping or hitting it hard as it may cause damage. Maintenance: Clean it with a soft, dry cloth regularly to keep it clear. If there are stubborn stains, you can use a little mild cleaning solution. But make sure to dry it thoroughly before using it again.