For observing line and band spectra from various noble and diatomic gases.
The capillary tube measures 80 mm length x 6 mm diameter.
Total length approx 220 mm.
Straight pattern, fitted with a 6.5 mm diameter contact cap at each end.

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Ltekonline are the manufacturers of Spectral Tubes Light and Optical Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities