Multifunction Optic Cleaning Pen The ProMaster multifunction cleaning pen is a handy tool for cleaning lenses & optics, LCD screens, viewfinders, and more. It has a 2-stage brush for removing dust and lint and includes a dust cap to keep the brush clean when not in use. The other side of the pen features two soft, dry-cleaning pads which do an amazing job of removing fingerprints and smudges without the need for any liquid cleaners. This dry-cleaning tip is removable and can be installed with either it's circular cleaning pad or its triangular cleaning pad facing out from the pen. You simply use whichever pad works best for the shape of the surface you need to clean. After using one of the dry-cleaning tips, just replace it's cap and twist it 1/2 turn to replenish the pad's cleaning chemical so it is ready for the next use.