This is incredible... hats off to the maker. That being said I really wish that the Chinese ETA 2824-2 clone that is the PT5000 would see more action in place of Seiko movements. It's more accurate, runs at 4Hz, and isn't too far off in terms of cost (last I checked - I could be wrong as regards bulk orders). Then again I don't know whether it can be modded to be "open heart" a la the NH38 so it might not have been appropriate for this project in particular.