HP 35S Scientific Calculator Programmable Calculator, F2215AA#ABA

As a lover of classic HP calculators, this is a nice machine, almost (but not quite) the feel of the classic HP41s and earlier HP calculators. Yes, RPN (the true way!). I have probably 50 or more functional classic HP calculators, I'm not entirely sure why I purchased this one, I am horribly under-using it, so don't take my word for your use, much better reviews of the machine are out on the 'net. But...I love the feel of the keyboard, and I love the fact that there's still a good RPN calculator out there.

Just say NO to the equal sign. Once you use RPN, you'll never look back. If you want a nominal orbital insertion, use the HP 35s!! The alternative is extremely embarrassing. And don't get me started on a poorly designed electrodynamic tether.

Much prefer the HP 15C Scientific Calculator which is what we use for technical projects. Bought the HP 35S as a backup, but hope we never have to go there.

[This review was collected as part of a promotion.] I have owned HP calculators for over 30 years. I still have a 15c and also a 42s and a Prime graphing calculator. HP makes the best calculators, period. I just love RPN, it SO superior to using algebraic calculation. The 35s does it all. The keys are just right. It has a lot of functions, but most are visible in blue or yellow or white, and not hard to find.

I have previously owned two HP's during my entire career as an engineer and while in college. Overall averaged about 16 years for each of the calculators. Both had been awesome. I am contemplating making a framed shadowbox featuring the old calculators as a way to honor them. I could not bear to just toss the calculators even though they had failed. I was so sad when each of them finally failed but happy to find the 35s. The new one sits on my desk ready for any calculation I need. I love them.