This is piece of lab equipment that allows for even mixing of low viscosity fluids for chemistry and other lab test. this unit has the same functionality as a $325 machine but only costs $30. http://youtu.be/d1GfcmM6fQQ -12v Dc electric motor like this. http://www.amazon.com/gp/product/B00NN6EXV0/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 -mechanical switch -single pole triple throw switch -LM317 with heat sink -power diode -47uF cap at 20V or greater -1K resistor -10k pot -printed parts -hot glue -12 to 20 volt power supply 16v at .5A is ideal. -Soldering iron and soldier -m5 x 10 bolt and nut -MR105ZZ Ball Bearing