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HP HP20S Scientific Calculator | 
| Brand: Hewlett-Packard
Category: CE
Buy Used: $98.29
Used (3) from $98.29
Avg. Customer Rating:  11 reviews
Media: Electronics
Shipping Weight (lbs): 0.8
Dimensions (in): 3.1 x 5.8 x 0.6
MPN: HP20S
Model: HP20S
UPC: 088698000335
EAN: 0088698000335
ASIN: B00000JBLP
Availability: Usually ships in 1-2 business days
Condition: HP 20S Scientific Calculator with and batteries. The manual and slip case are not included.
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| Features:
| • | Large, twelve-character display | | • | 10 data registers and 99 program lines | | • | Probability, trigonometric, and hyperbolic functions | | • | Keystroke programming | | • | Six built-in programs |
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| Editorial Reviews:
Amazon.com Product Description
A comprehensive scientific calculator, the Hewlett-Packard HP20S features easy-to-use algebraic entry and a built-in program library of over 100 scientific and mathematic functions. The library has frequently used functions like root finder, Simpson's rule of integration, complex number operations, 3x3 matrix operations, quadratic formula, and curve-fitting programs--all at the touch of a key. The HP20S also has essential trigonometry and math functions such as sine, cosine, tangent, exponential, and natural log and antilog functions.With this calculator, you can also perform English/metric conversions and fast conversions for mass, distance, volume, and temperature. And with the algebraic entry system, you can enter algebraic notations just as you would write them down on paper (a terrific time saver). For calculations you do routinely, the HP20S can record your keystrokes for future use--a great feature when you are working on a long-term project or set of calculations that you'll need to access repeatedly. This is an ideal tool for students or professionals in the sciences and mathematics, and with its small size, the HP20S conveniently slips into a backpack or briefcase for easy transport. --Dana Van Nest
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| Customer Reviews: Read 6 more reviews...
 Well Built Basic Calculator September 13, 2006
0 out of 1 found this review helpful
The hp20s is a well build basic calculator that will last through years of use. It was a low end model when it was introduced by HP and doesn't have RPN or any advanced math features, but what it does have is 99% of what most people need in a handheld calculator in a nice package. HP's and TI's latest lower end models are plastic junk in comparison.
Buy it if you can find one at a decent price...
 It was the best! May 25, 2005
0 out of 1 found this review helpful
I am not sure if I would buy one of this today but my brother had one I used too much and it was a very nice calculator! I still have it. Well finished, 99 lines of program, 10 memories avaliable, built in programs including a root solver, 3x3 matrix algebra and numerical integration. It is a nom RPN calculator but this is not a problem! Display is only one line and only numbers. It had a very nice manual. A very nice calculator I would like HP to make again. Perhaps with more program lines avaliable. Modern models like 33S are much more powerfull but don't have the same quality. HP-20S was a real HP calculator!
A Great Calculator for that Quick Calculation October 4, 2003
2 out of 3 found this review helpful
Let's face it! If you are going to do a complex calculation, you are going to break out your PC and use MATLAB (insert your own favorite mathware here) where you can A) do the calculation right and B) not have a take a coffee break while your graphical calculator thinks. But so many times a day there is that quick calculation you need to run. What you need is a basic scientific calculator that can handle any of those run of the mill number crunches. I got my first HP20S as a science fair award when I was in High School and I used it for this purpose all the way to finishing my Masters in Engineering. I left my calculator behind in the lab when I graduated because I stupidly had used it for months wearing epoxy sticky latex gloves (the calculator worked fine, but who wants to use a sticky calculator). I have small hands and I was able to hold this calculator in one hand and make all necessary computation using only a thumb. This is a feature I sorely miss! Also, the keys would go "klick-it" when you depressed them so that you had very nice tactile feedback. One caveat, I can only speak to the calculator in the image above, and not to any changes that may have been made. Mine was originally purchased in the early 1990's! But boy I miss it!
Durable, functional and comprehensive yet Stylish October 21, 2002
2 out of 3 found this review helpful
I have simply fallen in love with this one. There are just very few things that one can say are wrong with this calculator. In fact, i am really having to stretch my memory to find some faults in it. Someone dropped a cup a boiling tea over it just before one of my major exams. It worked then, and is still working just fine. I love the feel of the keys, since they arent as feeble and non existent as the ones in some of the other ones. It gives you a solid rugged look. Once you get used to this one, it is going to be very hard for you to switch to anything else. Trust me on this!
Good Calculator but beware of the newer version September 6, 2002
7 out of 7 found this review helpful
This calculator is a cousin of the 10B finacial calculator (now discontinued). It's a good calculator with good button feel and a lot of preprogrammed functions including stats. However, the newer models have the keys and faceplate markings written in new colors that are hard to see. The picture on this page is of the old version of the calculator. The colors on the new ones make the calculator much harder to use in my opinion. They seem to get lost on the brown background.
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