Comment by Bad_Initialism

7 hours ago

Well, just use your USB spectrometer, of course.

...you do have a USB spectrometer, don't you?

I have mine in my bedside drawer. I use it almost as often as my multimeter.

Does yours measure wavelengths that short? A lot of low cost spectrometers don't, because inexpensive glass and plastic optics transmit visible and near-IR radiation but significantly impair shorter UV wavelengths.