I have one, they will ship it to you for evaluation for thirty days.If you like it then you can pay for it, dont like then you can send it back. I find it very usefull since it will briefly apply a load to the circuit and calcualte the voltage drop for you. The tester has helped me find poor connections. I got mine on a special which they may still have, give them a call. http://www.tasco-usa.com/inspectorIII.htm