What safety feature should be present in all power tools?

The presence of an on/off switch or safety lock in all power tools is crucial for ensuring user safety. This feature allows the operator to easily turn the tool off in case of an emergency or if the tool is not in use, which helps to prevent accidental starts that could lead to injury. A safety lock, in particular, enhances the security of the tool, especially when stored, as it prevents unauthorized or unintentional activation.

While features like an automatic feed, battery indicator, and cutting guide can enhance the functionality and usability of power tools, they do not directly contribute to the fundamental safety of the equipment in the same way that an on/off switch or safety lock does. Therefore, emphasizing safety mechanisms like the on/off switch or safety lock should always be a priority in the design and usage of power tools to protect the operator and bystanders.