This is a must have if you have an electric fence! I bought mine about 15yrs ago for $100. But it was the best money I’ve spent. It will save you hours of walking and looking for a short. The tool will tell you which direction the short Is and how significant the short is. I remember fretting about spending the money. I went in for a cheap tester and they were out. This was my only option. I am forever grateful I bought it.