The goal of this kickstarter is to raise $8,000 to fund the manufacture of an affordable scientific colorimeter kit for educators, students and DIY scientists. The colorimeter kit is an open source hardware project. Colorimeter design files and software are all available at https://bitbucket.org/iorodeo/colorimeter/.
What is a colorimeter ?
Colorimeters are analytical devices commonly used in science labs to measure the concentration of a solution from its light absorbing properties. Colorimeters are extremely useful and flexible lab instruments for a wide range of science education labs.
There’s also an Instructable here.