Help in choosing a new calculator

[Marco Polo]

(09-20-2016 10:05 AM)Vtile Wrote:  Also one feature to test out are the units system in this family of HP calcs. Don't ask how to attach them to your own equations, because I have no idea.

It is a feature present since the 48sx. For my job is vital, that's why I don't move from the 48-50 series and I don't consider the Prime, which IMHO is a step back from the 48-50 series for real engineering work.
Basically, you enter the equation as usual. If needed add units to numbers (I. E. Constants).
In numerical solver, define all variables by putting numbers with units. Units shall be consistent.
Then you can solve for any variable, keeping in mind that the other variables will be treated as constants.