A number of analytical measurement assays have already been developed and documented with the open source colorimeter, including assays for measuring iron, nitrate, potassium and more. However there are still many more analytical measurements that can be carried out using this very simple and cheap measurement device. 

For an overview, a list of assays developed or under development with the colorimeter can be found here

Colorimeter users are welcome to contribute an assay or lab that they have developed with the colorimeter.