The same collimation slit found in our Foldable Mini-Spectrometer and Desktop Spectrometer kits. These collimation slits provide a very clean beam of light through their .4mm slit. They are made with silver nitrate photo emulsion on thin, flexible acetate.
Make sure to handle with gloves as hand oils will affect your spectroscopy.
One slit in each order.
Or you can buy a bundle pack with 4 narrower sizes to test out. The bundle includes .09mm, .12mm, .15mm, and .18mm