One of the most important concepts in Chemistry that is often ignored because the equipment is expensive or takes time to set up. This is a simulation of spectrum tubes and a spectroscope. The student turns on the tubes and adjusts the spectroscope over the glow to observe the spectral lines. The simulation can be used as a brief presentation of the concept or used with the included scaffolded notes as a learning, thinking activity. The simulation can be run as Spectroscope.html, .app or .exe.