Question: What's an easy way to compare two liquid samples with a spectrometer?

Hi, @programmer1200 -- saw your post on a cuvette holder and wondered if it would be possible to use it for two cuvettes simultaneously? Perhaps by modifying the design?

Yes it is possible to redesign it for two cuvette at one time would just need to widen the area toward the spectrometer and double the area on the top. If you like I could here in the next week get started on a mod version.I'm curious what would be your need to examine two cuvettes at one time?

Here's one attempt from a few years ago: https://publiclab.org/notes/cfastie/02-25-2014/mobile-cuvette-holder

This was designed for a laser, but could be adapted for back lighting via LED as well.

Photo and captions via @cfastie:

This can be a helpful way to get the same exposure for two samples at once, which can be important when using a less-controlled camera like a webcam. That way you're not worried that the exposure settings would be different -- as long as the light is hitting both sample containers identically!

We had an old idea for this a ways back -- posted below. But yours connects so beautifully to the spectrometer, it's a great improvement!

Related:

How can we detect contaminants in water samples with a DIY spectrometer using reagents?

https://publiclab.org/notes/warren/12-18-2017/can-a-diy-spectrometer-be-used-to-measure-water-turbidity

It would also be really cool to see a design adapted for the Lego Spectrometer!

https://publiclab.org/wiki/lego-spectrometer