A Calculator is one of the most important tools for electrical engineers. As
an electrical engineer, I need a calculator which is capable of handling
complex numbers I had been using two HP-42C for more than 10 years.
HP-42C is discontinued now and one of mine is stolen and the other is
broken. I switched to TI-89 for a while, but the characters on TI-89 LCD
were so small for eyes of 55 years old man. Now I am using HP-50G
which has larger LCD.
I recommend TI-89, HP-49G+ or HP-50G to electrical engineers. These
can handle complex numbers for usual calculation and in matrices.
There are some useful sites for these calculators.
Comparison between TI and HP:
HP Calculator sites:
TI Calculator sites:
For daily calculations, I prepared some calculators with Excel. They are
useful for me, so probably for you also, If you are interested in, down load
and give it a try.