This Spectrum Tube Holder has it's own power supply and is fitted with a safety door. Designed for use with 260mm long spectrum tubes, firmly preventing the user from touching the electrodes. The matt black colour eliminates the distracting ambient light and the soft spring action protect the tubes from breakages. Spectrum Tubes are not included. Operates on 220V AC via the Mains Supply. Full instructions supplied. Technical Specifications:. Input Power: 220V AC, 50Hz. Output Rated: 5000V - without Spectrum Tube, 1000V at 10mA with Spectrum Tube. Operating Temperature: 10°C - 40°C. Storage Temperature: -20°C - 40°C. Spectrum Tubes are available as a bundle of 4, or to purchase separately:. Bundle of 4 (Hydrogen, Neon, Nitrogen, Oxygen) - B8R06832. Argon - B8R06989. Helium - B8R06986. Hydrogen - B8A46539. Krypton - B8R06991. Mercury Vapour - B8R06990. Neon - B8A46565. Nitrogen - B8A46541. Oxygen - B8A46553. Xenon - B8R06992.