Dr. Joshua M. Pearce of the Michigan Technological University has created a 3D printed device which may change the face of water testing around the world. Along with the concept of using SODIS for water purification (a purification system using table salt), he has designed an affordable 3D printed water tester that can be used right at the source rather than a lab. It is designed with Arduino software using GitHub firmware, and was produced with a RepRap printer. See more information: http://3dprint.com/26622/michigantech-sodis-water-test/

Below is a photo of the water testing device: