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What calculator do you use ?
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atferrari:
Casio fx-570ES
saturation:
I still find using hardware calculators for brainstorming, field calculations and cross checking my software faster than using RealCalc on my phone or software calculators on the PC, except when I have to transfer numbers often to another app for further evaluation. 

When US schools went on summer break, Walmart and Amazon dumped inventory on the Casio FX260 for $6, FS-115ES [ called FS-991-ES elsewhere] For $11 and the TI-36XPro for $18.  I picked up a few Casios and a TI.

The last two are staples in US colleges for math and engineering courses.  They can do definite integrals, polynomials, expression evaluation and much more, have been around for nearly 15 years [ as prior model, without 'ES' for Casio or Pro for TI] and have been reviewed extensively by many for strenghts and weaknesses.

I've never liked the first version of VPAM and wrote such calculators off for many years.  But the updated 'VPAM' or textbook displays look very much like you'd write on paper and make entering fairly complex equations into these calculators easier.

Graduates of colleges >=15 years are likely seasoned veterans of these calculators but those of us who were in school before that will find these capabilities another timesaver worth a look, given the cost of these calculators.

There are also 2 other competing units with a similar breath of functions from Sharp and Canon, but they cost more and can be hard to find.  Casio and TI are the leaders in the education fields worldwide and one reason [ if not the only reason] these calculators are still made or so cheap.
TopLoser:
A 25 year old very battered HP 15C.  This thread has just made me realise how long it's stayed with me through good and bad, one of the few things that's stayed on my desk for more than a few weeks  ;)

Can't see me ever using anything else now, so much so that I've just been trawling eBay looking for a backup one, bloody hell they are more expensive now than when I bought it 25 years ago!!

Some years ago I sold the almost unused HP 16C I had, that fetched an astonishing amount on eBay.

Gasp... just found out they did a limited edition re-issue of it in 2012 - $180 list price and they're now selling for $600+ !! Reviews of it aren't very good either, the quality just isn't there.

ahhh and look at these...
http://www.swissmicros.com/

HighVoltage:

--- Quote from: TopLoser on November 24, 2014, 05:12:00 pm ---A 25 year old very battered HP 15C.  This thread has just made me realise how long it's stayed with me through good and bad, one of the few things that's stayed on my desk for more than a few weeks  ;)

Can't see me ever using anything else now, so much so that I've just been trawling eBay looking for a backup one, bloody hell they are more expensive now than when I bought it 25 years ago!!

Some years ago I sold the almost unused HP 16C I had, that fetched an astonishing amount on eBay.

Gasp... just found out they did a limited edition re-issue of it in 2012 - $180 list price and they're now selling for $600+ !! Reviews of it aren't very good either, the quality just isn't there.

ahhh and look at these...
http://www.swissmicros.com/

--- End quote ---

I did buy 4 pieces of the limited version of the 15C in 2012. The price I paid was just $ 125 and I thought it was a lot.
One for me a three for my friends. I should have bought 10 or more of them, knowing now that they go for so much.

The Swiss Micros clone is good as well, I have that one in my pocket all the time.

Also, there is a really good 15C APP for the iPhone and it works really well too.

The 15C is probably the best calculator ever made.


 
David Hess:
I finally replaced my HP-48 with an HP-50g.  My only complaint about the HP-50g is that it is slower latency wise than the HP-48.  I would like to know how they managed that with orders of magnitude higher processor performance.

If I could find a solar powered RPN calculator, I would consider it for when I do not want to carry the HP-50g.
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