Bertan Associates High Voltage Power Supply kV mA model- 1648 Got this from a government lab. Some sticker residue and sticker on front of unit. Some marker writing (all as seen). Both output voltage and output current displays have 3 position switches next to each other. Options on switches are anode, focus and grid-2. 3 output on unit, each has its own precision dial control knob. These are very rare. Get your back-up model NOW!!!! I don't know much about these. But I will try to answer your questions the best I can..... Powered on and seems good to go - money back if not satisfied with the unit in its current condition. ----- But Please note-** May have to do some calibration or minor repairs to work perfectly. FREE US 48 Shipping!!!! Will ship international - we get excellent international rates through DHL - please contact me for a quote..