This probe was designed to be the best available and provides many superior features such as; a stiffer probe for hard ground; Heavy-duty metal shaft that is less susceptible to snapping; Availability to add extensions by using couplers; Threaded tip that can be replaced after significant wear. It also provides protection up to 50,000 volts and can also be combined with the slide adapter to provide a mini slide hammer. The insulated soil probe is 3/8" rod x 48" long, but is available in longer lengths.