Bertan Associates High Voltage Power Supply Model#- 1793 Multiple Output Grid RARE Got this from a government lab. This is very rare and not to be found anywhere expect right here!!! Some sticker residue and sticker on front of unit. Has a three different grid knobs. Also an andoe and focus knobs as well. **Please note, as the picture shows, this will need calibration before use. So please take that into consideration. ** Please look at pictures. 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..