Mmmmmm..... in "The monopolar expedition", Leonard uses a Casio 1175....
again a not scientific calculator, imposible for physics
More over existing the Casio CFX40
Here a mistake (below on the right):
This is not a scientific calculator!! Impossible in this house
Here a nice find (if Im right)!
Is Rajesh watch the nice and rare Casio CFX40? I had one in last 80Â´s: