Tool balancers, also known as spring balancers, are devices used to suspend hand-operated tools in a position where they can be easily reached and manipulated. They typically consist of a retractable cable, a spring mechanism, and a housing. The primary purpose of a tool balancer is to counterbalance the weight of a tool, allowing the user to move and use the tool with minimal effort. This not only reduces fatigue for the operator but also improves efficiency and safety in the workplace.