The GSC International 1865-4 Hydrogen Spectrum Tube is a high-quality teaching tool designed to demonstrate the emission spectrum of hydrogen. Constructed from 26 cm borosilicate glass, the tube is sealed with low-pressure hydrogen gas and emits a clear spectrum when connected to a high-voltage power supply such as the 1865-PS. The hydrogen spectrum reveals the Balmer series lines, including the visible red (H-alpha), blue-green (H-beta), and violet (H-gamma) lines, which are essential for studying atomic structure and electron transitions. Commonly used in physics and chemistry education, this spectrum tube provides clear demonstrations of electron excitation, photon emission, and the relationship between atomic energy levels and emitted light. Each tube is individually labeled with the gas symbol and securely packed in foam-protected triangular cartons, ensuring safe transport and storage for classroom or laboratory use.