Device with which I can measure the frequency of light

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SUMMARY

This discussion focuses on devices for measuring the frequency of light, specifically recommending handheld radiometers and spectroscopes. A high-end option is available at Shop Stellar Net, while more affordable alternatives can be found at Vernier. For basic needs, a simple spectroscope can be purchased for around $10, and DIY options using cardboard and CDs are also viable for capturing light spectra.

PREREQUISITES
  • Understanding of light frequency measurement
  • Familiarity with spectroscopes and spectrometers
  • Basic knowledge of DIY electronics
  • Experience with light diffraction principles
NEXT STEPS
  • Research DIY spectrometer construction techniques
  • Explore the capabilities of handheld radiometers
  • Learn about light diffraction and its applications
  • Investigate free software for spectral analysis
USEFUL FOR

Students, educators, hobbyists, and professionals interested in optics, light measurement, and DIY science projects will benefit from this discussion.

Sanev
Does anybody know where i can buy a device with which i can measure the frequency of light from various sources such as bulb light?
 
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The OP hasn't specified the required precision of measurements. All of the devices linked to so far are high-end, multi-function tools.
But if all that is needed is just to be able to split the light into its component frequencies, and evaluate them visually, there are much less expensive options.
A spectroscope (or spectrometer) at its most basic is just a diffraction grating in a tube, optionally with a frequency scale.
Searching for spectroscope on Amazon on Ebay, or just googling for 'spectroscope for sale' will net plenty of hits, including ~10$ classroom tools.

These days you can even build your own on the cheap. The most affordable option is a DIY spectrometer made out of a cardboard box and a CD:


More examples can be found on youtube by searching for DIY spectrometer. More involved ones provide means of capturing the spectra with a webcam or a smartphone, and analysing them with free software or apps.
 
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