As seen in the article
here.
This PCB in conjunction with the article, "Mass Confusion: The End of the Kilogram as We Know It" by C. A. Hamilton is a science project that tries to give an inkling of the complexity of metrology research. It touches a multitude of areas in physics, electrical engineering, and metrology including energy, power, and moment of inertia calculations; op-amp circuit design; DC motors; error correction; and uncertainty analysis — a perfect combination for physics or EE lab experiments.
Also includes the LS7210 programmable timer chip!