Spectrum discharge tubes are used to show spectral lines of pure substances. Glass tubes with central capillary portion of about 9-10cm long with electrodes sealed at both ends and connected to lead wires protected by metal caps.  Except for Neon and Helium, these cannot be used as lamps are are only for intermittent use.

There are 2 ways to run the  spectrum tubes:

1. With a spectrum tube power supply (3785001); or

2. With a spectrum tube holder (SAB), induction coil (EM013301) and power supply (2633001).