Spectral Tubes
Product Code : LSK-PL-10349
Spectral Tubes (SKU LSK-PL-10349) are gas-filled discharge tubes for observing the line and band spectra of various noble and diatomic gases. Each straight-pattern tube is about 220 mm long, with an 80 mm by 6 mm capillary where the glow is brightest and a 6.5 mm contact cap at each end. They suit senior school, B.Sc. and engineering physics labs. Science Lab Supplies makes the tubes at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and its factory quotes them per gas to schools, colleges, tender contractors and distributors.
Specifications
Capillary, cap and length figures for the straight-pattern spectral tube each have a row below. In short, a narrow central capillary 80 mm long and 6 mm in diameter concentrates the discharge into a bright line source, a 6.5 mm contact cap at each end connects the tube to its holder, and the overall length is about 220 mm.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10349 |
| Pattern | Straight |
| Capillary length | 80 mm |
| Capillary diameter | 6 mm |
| End contacts | Contact cap at each end |
| Contact cap diameter | 6.5 mm |
| Total length | Approx. 220 mm |
| Gas fillings | Various noble and diatomic gases |
| Spectra observed | Line and band spectra |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Spectral Tubes
When a discharge passes through the gas, each tube glows with the characteristic colours of its filling. Viewed through a grating or spectroscope, noble gases show sharp line spectra and diatomic gases show band spectra, giving students direct evidence of quantised atomic energy levels and a basis for identifying elements.
- NCERT Class 12 physics, atoms: line spectra and energy levels, contrasted with the continuous spectrum of the halogen lamp in the Parallel Beam Light Source.
- Class 11 chemistry, structure of atom: emission spectra of elements, with the light dispersed by a Glass Prism (Equilateral, 50 x 50 mm).
- B.Sc. physics: measuring wavelengths of spectral lines with a grating and spectrometer.
Spectral tubes are run from a high-voltage spectral-tube power supply. Only switch on with the tube seated in its holder, keep the lab under teacher supervision, and handle the glass with care.
Standard Scope of Supply
Spectral Tubes are supplied as the straight-pattern tubes described above, with the gas fillings you choose itemised on the quotation. A power supply, tube holder and viewing grating can be added as separate lines on the same quotation if your laboratory needs them.
Packing, MOQ and Lead Time
Order one tube for a demonstration or a set of different gases for a full spectroscopy practical. The quotation gives packing, delivery time and price per quantity and per gas, and gratings or optics items can be added to the same quotation.
Holding an Importer-Exporter Code as a registered exporter, Science Lab Supplies can ship to buyers in the Philippines, Nepal, Bangladesh, Zambia, Rwanda and South Africa. Name each gas and the number of tubes in a message on the contact page or as lines in the enquiry cart; spectroscopy items bought by tender are handled through the lab tender page.
Frequently Asked Questions
Which gases are available in the Spectral Tubes?
The range covers various noble and diatomic gases. Please list the gases you need through the contact page, and each one will be itemised on the quotation with its quantity.
What is the difference between line and band spectra?
Single atoms, such as the noble gases, emit sharp separate lines. Diatomic molecules add vibrational and rotational levels, so their light appears as closely packed bands.
What size are the tubes?
Each straight tube is approximately 220 mm long overall, with an 80 mm long, 6 mm diameter capillary and a 6.5 mm diameter contact cap at each end.
Who manufactures these tubes?
The straight-pattern tubes are a Science Lab Supplies product, made at its own Saha, Ambala factory in India, so your quotation for each gas comes from the maker rather than a distributor.
Related Spectroscopy and Wave Optics Equipment
The Physics Lab and Light and Optics items below complete a spectra lesson: gratings, a spectrometer and a prism to split the light from the tubes, three wave-optics sets for diffraction and interference, and a photoelectric apparatus that also shows the quantum nature of light. All of them can join the same quotation.
- Diffraction Gratings with Holder — 20 x 10 mm gratings mounted between glass plates.
- Laboratory Spectrometer — angular measurements for refractive indices and spectral line profiles.
- Spectrometer Prism Separates Light — equilateral prism for dispersion and wavelength analysis.
- Diffraction and Interference Study Kit — 650 nm red laser with Young's slits and a Fresnel lens.
- Optics Set OW1, Wave Optics — materials for 14 wave-optics experiments in one case.
- Apparatus for Studying Interference and Diffraction — laser diode, optical bank, screen and 13 objects.
- Photoelectric-Effect Apparatus — phototube with filters at 404, 450, 505, 546 and 578 nm.
Browse the full Physics Lab range, the Light and Optics range, or all physics lab equipment.
Last updated: 22 October 2026
