$2 Conductivity Probe
thingiverse
This simple conductivity probe is built using electronics from Lectrify http://lectrify.it and copper tape. The cost of the LED and battery comes in at $2 when purchased in bulk. Since Lectrify components are designed to fit right onto standard Lego bricks, designing for them is a breeze: just make 5mm posts 2-3mm high, spaced 8mm apart from each other... Teachers looking to take learning further with this project should encourage their students to design their own probes based on what they want to analyze.
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