This antique device made by Frank S Betz Co is a unique addition to any medical  or antique collection. It has a dial, measuring DC Milliamperes, two radio tubes (No 80), and two switches--one showing Off or ON, P or N. The other switch lets one choose from L or H. It also has a rotary dial. It was manufactured before 1930 and falls under the category of science and medicine. This quack medical device, known as Model G, was used as an apothecary cure-all device and is perfect for display purposes. If you need to grow back your hair this device allegedly does the trick! Weighs about 10 lbs.  I plugged it in and I turned it on and it made some noises. Comes with some other cables and a leather strap.