Beware not to buy HP Prime, if you are engineer!

[pier4r]

The prime is a very nice math environment. If one is an engineer and can type formulas the system is good enough.

Also is not really scientific (and therefore out of the realm of engineering) to sell a subjective point of view, as it is mine above or the one from the OP, as a fact.

If one wants to be a bit more serious one should define what a calculator should do for an engineer, then finding consensus on the definition. Given the definition then one can proceed to see if a calculator is fitting or not.