The home office has never been more functional or productive than it is today. With video conferencing, online workspaces, and group communication apps, about the only thing missing is a virtual water cooler. That said, there still are certain hardware components that every remote worker should own, and one of those is a document scanner. From replicating confidential office forms to digitizing film slides and photos for personal use, the scanner is a tool that really does not have a substitute. When you need it, you need it. Here are several variations on this critical home-office device.