The best insulated soil probe available, period. This probe can also be combined with the Slide Adapter to create a mini slide hammer probe. The steel shaft, tip, and handle are threaded allowing easy replacement or for adding additional extensions. This probe was tested up to 50,000 volts following ASTM F711-89 testing procedures, by an independent testing lab. It was also both dry and 48 hour water soaked tested up to 45,000 volts by a major utility company.