The Public Lab Store Starter kits for DIY environmental science

Acetate Slit Bundle Pack


This is a bundle of narrow variants to the .4mm slit found in our spectrometry kits. These collimation slits provide a very clean beam of light through a .09mm, .12mm .15mm or .18mm slit. They are made with silver nitrate photo emulsion on thin, flexible acetate.

Why would you want these? Well, the short answer is that if you have enough light available, you can use a smaller slit to get higher resolution. A wider slit increases sensitivity by admitting more light, but lowers resolution because spectral lines will be more blurred. Choosing a slit is a balance between these, but if you can increase the light available, you can typically use a narrower slit and get good resolution without losing signal strength.

We make this range of apertures available to allow you to experiment and find the optimal size for your application.


Make sure to handle with gloves as hand oils will affect your spectroscopy.

Bundle Pack includes different sizes at a discounted price!

$8 for all four!


Want to carry our kits in your own store? Order wholesale! Contact the kits team.

Community Science Forum: Frac Sand

Our quarterly print publication has a new name, and a wider scope. It's now called the Community Science Forum. This issue is focused on frac sand, and in particular on the work being done in western Wisconsin by community groups concerned about air and water quality impacts of mining operations there.

Usually $5, we're offering the new issue at an experimental price of $2 plus shipping.

Event Packs

Do you have an event planned and would like to introduce Public Lab to your community? Order a $10 Event Pack with GMF and foldout maps!


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