The Rspec Explorer is a web cam with diffraction grating attached. A live image, or previously acquired pictures of a spectrum can be viewed and shown to a class, and features explained and analyzed.
The Rspec software (shown above) allows for spectral analysis, and can be downloaded here: https://www.fieldtestedsystems.com/GetRex/. As long as the camera is plugged into your computer, a software license passcode is not required. Both mac and pc versions are available.