What is a requirement for a test tool according to safety practices?

A critical requirement for a test tool according to safety practices is that it must be independently tested, marked, and certified. This ensures that the tool meets specific safety standards and has undergone rigorous evaluations by recognized testing organizations. Independent testing serves to confirm that the tool can perform its intended function safely and reliably, protecting the user from potential hazards during electrical measurements. Certification marks provide assurance that the tool adheres to industry regulations and safety requirements, which is essential for maintaining safe work environments. The reliance on certified tools reduces risks associated with electrical testing, thus promoting safety in electrical measurement practices.