Sharp EL 501 XB Calculator

I specifically chose the model I ordered.  I am happy with the order.

I am a consultant engineer.  I need a calculator with a decent range of scientific functions that is quick to use. Ideally I like to carry it around in my jacket pocket and this is the only thing lacking in this model. My worn-out 40 year old Sharp EL 515S was perfect for this.\nA minor point also is that unfortunately you have to use 2nd function to access pi, a frequently used function in my case.