Your Safer Source for Science

Since 1977

Dear Valued Customers: The state of Illinois has declared a mandatory shutdown which is currently in place. As an essential
business serving the needs of the
education and healthcare communities, we will be continuing to process and ship orders as
well as provide ongoing customer service support. We’re taking every necessary precaution in continuing to serve our
communities so that you have
one less thing to worry about. Please continue taking care of yourself and others.

Address P.O. Box 219 Batavia, IL 60510
Phone 800-452-1261
Fax 866-452-1436

Product Details

Spectrum tubes are glass tubes filled with a gas, usually that of an element or small molecule. Sealed metal electrodes are located at the ends of each tube. When a spectrum tube is placed in a spectrum tube power supply and the power supply is turned on, an electrical discharge is passed through the tube, causing electrons in the gas to be excited. As the electrons relax, they emit light-a characteristic color for each gas. When students view the lighted tube through a spectroscope, they can observe the unique set of spectral lines for each gas. Spectrum tubes should only be used intermittently and are not intended as a continuous source of light. It is normal for the iodine spectrum tube to contain small pieces of solid iodine.