I hope to order it next week. I don't think I will use one enough to warrant buying a better one for now. I don't recall anyone showing how they match the impedance of the battery to a circuit, so I am heading in that direction. JB has said it over and over again, but still it seams to be overlooked - along with the ground connections on some devices. I plan to build a device that is impedance matched, uses a flywheel and has an earth battery connection. I am getting prices to build such a device.