Gas discharge tube filled with low pressure helium. Shows helium's emission spectrum when ionized by a power source such as an Elenco STPS-1 Spectrum Tube Power Supply, a plasma ball, or albeit much fainter, the static charge that can sometimes come off of bubble wrap! When the emission spectrum is viewed thru a spectrometer in a dark room, one can observe the spectral lines characteristic of helium.
- Fill gas/vapour: Helium
- Dimensions (overall): ~26cm (~10.25") long
- Dimensions (central capillary portion): ~10cm (~4") long
- Made in India