Spectrum Tubes - NitrogenNitrogen gas-filled discharge tube for studying typical spectra of the different gases and for use in calibrating spectrometers. The glass body is provided with metal end caps and is constricted along the middle portion to concentrate the discharge glow.Tube Length: 260mmStrike Voltage: 3000V-4200VMaximum Recommended Running Current: 3mARecommended Run Cycle: 30 seconds on 30 seconds offRequires the following equipment to operate:Spectrum Tube Holder - B8R08098E.H.T. Power Supply - B8R02653E.H.T. Safety Experiment Leads - B8R07149Alternative individual tubes are available to purchase separately:Argon - B8R06989Helium - B8R06986Hydrogen - B8A46539Krypton - B8R06991Mercury Vapour - B8R06990Neon - B8A46565Oxygen - B8A46553Xenon - B8R06992There is also a bundle of 4 tubes available - B8R06832 - Hydrogen Nitrogen Oxygen Neon