Here's a list of things to do with your spectrometer, whether you're a teacher, a hobbyist, or a grassroots scientist. Please add your own, and include how much time it'll take, an estimate of the cost, etc. ##Activities## ###Measure sodium lines### _15-20 minutes, 1 bunsen or propane burner_ Read more at: http://publiclaboratory.org/wiki/spectrometry-activity-sodium-lines ###Calibrate your spectrometer with a CFL bulb### _5-10 minutes, a compact fluorescent lamp (CFL) and optionally a green laser pointer_ (Base this one on http://publiclaboratory.org/wiki/spectral-workbench-calibration but include more explanation etc) Check your calibration with a green laser, which should show up as 532 nanometers. Read more at: http://publiclaboratory.org/wiki/spectrometry-activity-calibration ###Measure an atmospheric absorption spectrum### _5-15 minutes, the sky_ Find the [Frauenhofer lines](https://en.wikipedia.org/wiki/Fraunhofer_lines): https://spectralworkbench.org/tag/sunlight https://spectralworkbench.org/spectra/show/913 (especially good!) Try different directions in the sky, towards and away from the sun. Where did you point your spectrometer to get the clearest absorption lines? Any idea why? [Post a research note](/note/add) with your data and describe what you did. Read more at: http://publiclaboratory.org/wiki/spectrometry-activity-atmospheric-absorption -- add more activities here --