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|  | |  | | | HP 35s Scientific Calculator | | | | | SKU:
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Usually ships in 1 business days | | | | | | Get professional performance from HP s ultimate RPN scientific programmable calculator - ideal for engineers, surveyors, college students, scientists and medical professionals. Scientific projects require accuracy, functionality and dependability for success. The HP 35s scientific programmable calculator delivers them - and more - with features that include 30KB user memory, your choice of RPN and algebraic entry-system logic, a convenient two-line display, and the time-saving HP Solve application. | | | |
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| $59.99 | |
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| $46.99
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| | Product Details | | Product Length: | 6.22 inches | | Product Width: | 3.23 inches | | Product Height: | 0.72 inches | | Product Weight: | 3.0 pounds | | Package Length: | 9.4 inches | | Package Width: | 7.3 inches | | Package Height: | 1.5 inches | | Package Weight: | 0.75 pounds | | Average Customer Rating: |  based on 211 reviews |
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| | Features | Robust and economical scientific calculator100+ built-in functions; 30 KB memory with 800+ registersSupports RPN and algebraic data entry2-line, 14-character display1-year limited manufacturer's warranty
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| To see price, add to cart. | New | | | $39.94 | Refurbished | | | $44.51 | Refurbished | | | $44.51 | Refurbished | | | $44.51 | New | | | $44.95 | Used
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- Mint | | | $49.95 | Refurbished | | | $49.99 | New | | | $49.99 | New | | | $51.99 | New | | | $52.50 | New | | | $54.15 | New | | | $54.77 | New | | | $54.89 | New | | | $54.99 | New | | | $55.59 | New | | | $56.61 | New | | | $57.12 | New | | | $57.37 | New | | | $57.62 | New | | | $58.48 | New | | | $58.58 | New | | | $59.95 | New | | | $61.99 | New | | | $62.16 | New | | | $62.89 | New | | | $64.45 | New | | | $64.61 | New | | | $65.26 | New | | | $67.99 | New | | | $70.65 | New | | | $70.80 | New | | | $76.66 | New | | | $77.28 | New | | | $63.05 | New | | | $81.34 | New | | | $63.94 | New | |
| New | |
| To see price, add to cart. | New | | | $44.51 | New | | | $46.52 | New | | | $46.57 | New | | | $46.99 This item ships for FREE with Super Saver Shipping. | New | | | $47.99 | New | | | $48.02 | New | | | $49.00 | New | | | $49.99 | New | | | $49.99 | New | | | $51.99 | New | | | $52.50 | New | | | $54.15 | New | | | $54.77 | New | | | $54.89 | New | | | $54.99 | New | | | $55.59 | New | | | $56.61 | New | | | $57.12 | New | | | $57.37 | New | | | $57.62 | New | | | $58.48 | New | | | $58.58 | New | | | $59.95 | New | | | $61.99 | New | | | $62.16 | New | | | $62.89 | New | | | $64.45 | New | | | $64.61 | New | | | $65.26 | New | | | $67.99 | New | | | $70.65 | New | | | $70.80 | New | | | $76.66 | New | | | $77.28 | New | | | $63.05 | New | | | $81.34 | New | | | $63.94 | New | |
| Used | |
| $44.95 | Used
- Mint | | | $49.95 | Used
- Mint | |
| Refurbished | |
| $39.94 | Refurbished | | | $44.51 | Refurbished | | | $44.51 | Refurbished | | | $49.95 | Refurbished | |
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| | Customer Reviews | Average Customer Review:
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 The quality feel is gone Sep 02, 2010
Being a long term HP user I can say without a doubt that the solid and quality feel that old HP calculators use to provide is gone. This calculator looks a little big but weights little, it feels "empty". The plastic parts are not as good as the old ones. The keyboard feels almost like the old ones, I haven't missed strokes as other users say. The ON key doesn't work as it is supposed to (following the shift color logic): Do you need to press the blue shift ket in conjunction with the C key to get it ON?? NO. To turn it OFF any of the colored shift keys do the same thing. Besides, the arrows showed in the shift keys don't have the correct logic, according to the way the functions are printed, the blue key seems to be upside down. I like the display arrangement, but the old 41 series display was way better and unique. Haven't used it for long or for complex calculations but it works ok. Finally, one of the additional things that HP users liked was the professional spiral bound manuals, now you need a computer with a cd player (a netbook is not good enough) to read the manual of a calculator!! Absurd. Today's HP calculators are not above the competition the way they use to be. 20 years ago you could be proud of being the owner of a HP calculator, today is not easy to justify purchasing one. Anyway, for me, there is still NO WAY to use a Casio for the simplest calculation, it has to be an HP because of the fabulous RPN, so having this one is a bitter sweet feeling.
 HP 35 Aug 30, 2010
A very good Calculator for the price. I have a HP 48S that I used for years. I bought the HP 35 for my PE Review. This is one of two HPs permitted in the exam room.
3 of 3 found the following review helpful:
A great hp calculator with a few glaring problems Aug 15, 2010
The hp 35s is very worthy update as the at-your-side workhorse math and engineering calculator. Like many old engineers, I'm a little crazy about how good a calculator can be, so this review is a bit long. If you miss your old hp15c and want something to work in RPN mode, this is a good modern rendition. Algebraic mode is ok, but a little less well worked out. While mostly good, there are a couple real flaws in the calculator, described below.
Good news: the physical aspects are well done: the buttons are good, the display is clear, it's light and fits well in the hand, and it comes with a good slipcase, and the manual seems pretty good. The 2-line display is great compared to the old 1-line models, often allowing you to see what you keyed in and the answer simultaneously. The feature set is close to the sweet spot for math and engineering. The 35s has the common math functions available with a logical button layout, and it mostly has good support for complex numbers. Simple programming is available -- many will never use it, but it's neat to have it in reserve if you get in a case where it's really needed.
Bad news: while most of the interface is fine, there are a few bizarre flaws.
The most boneheaded design decision relates to how "all" mode, the default display mode, works. Suppose the result is "1.1234567812e-12" Depending on how many digits there are in the fraction, what appears in the display is "1.123456781e-1" -- instead of showing the full "e-12" exponent, it just shows what fits, like "e-1", and there's a little extra annunciator in the display, telling you that you need to scroll to see the rest of the result. It's unfortunate that the displayed result looks very much like a final answer, and you need to notice the annunciator and then do these extra key strokes to see the number. Obviously seeing a numeric result is kind of a common case for a calculator! You can see in other reviews how some people are confused by this "why can't I just see the answer" case, and can't understand why the calculator makes it so hard. The correct design for progressive disclosure of information is to show the *most important* information first, and allow the user to see the details if they care. In this case the "e-12" is very important, where the 8th etc. digits of the fraction are the least important. The way it should work is display "1.1234567...e-12" -- showing the information you most care about, and the "..." is the cue that more details are available, and a keystroke in that case can scroll to show the whole result. The reality is that 99% of the time, the user will be happy with what's displayed, and no extra keystrokes are required. That's how it should work. The workaround is to run in "fix-6" mode or whatever, preemptively limiting the digit range available but avoiding the unusable "all" mode.
There are also flaws in the trigonometric functions where they drop significant precision for cases near 90 degrees, vs. the 10-12 digits expected. For example tan(89.99999) returns 5,729,578.122 which is incorrect beginning at the 8 (google for hpmuseum hp35s bug list). Though unlikely to cause practical problems, this sloppy attitude about precision is not what you want to hear about your calculator. I can't imagine how they could have thought that being sloppy with arithmetic was a ok idea .. they're in the *calculator* business for gosh sakes. I'm so sorry if they find it a bit trying to get all those fiddly little digits correct! This is also sad given the amazing reputation for precision of the earlier generations of HP calculators. Or perhaps it's just irony -- William Kahn, a giant in the field of computer science for designing accurate computer arithmetic, was hired by HP to fix problems with transcendental functions in the original HP 35, and he went on to create the extremely accurate arithmetic for which later HP equipment became famous (see Kahn's wikipedia page). Since the HP 35s commemorates the original HP 35 ... perhaps they put some bugs back in to really capture the spirit of the original! (Of course HP fixed the original HP 35.) The 35s bug has been public since 2007, and not a peep out of HP. I can't imagine how HP got in a situation where fixing their own product is too hard, so they just keep selling it with known flaws. (Organizational tip: don't fire *everyone* on the engineering team ... always keep that one guy just in case!) Nobody should have to think about if they happen to be hitting a case where their calculator is inaccurate. HP pioneered that idea.
The complex number support, a real core use case for engineers, works pretty well on 90% of the functions. But on 10% it just fails and returns "syntax error". It kind of takes the fun out of complex number support if you are trying to remember which nicely labeled buttons do and do not work.
Small feature wishes: I wish STO/RCL were separate buttons, and it's ok to maybe make MODE and some of the programming buttons a little more buried. I suspect that's a better fit for the common use pattern. Ultimately, the design team should have a 100 hours of video tape to support what the real use pattern is, or just hand out instrumented calculators to college students. When I enter a number and hit 1/x or SIN in alg mode, it should just do the right thing .. don't be hidebound to the input paradigm, instead hack the input processing to make the common cases work. In fact I would make a little animation in the display for that case, as it fixes up your input. That would immediately be the most memorable and talked about feature. Also the polar/rect and complex disassembly features are missing, and those are pretty common engineering cases, and the trivial unit conversions maybe don't need so many dedicated buttons. Don't add buttons; the size is already good. Just use the existing ones better + use menus for the rare cases. I understand the curb appeal of unit conversions, but let's get those buttons back for real engineering cases. Finally for hex conversion .. I wish it just knew when I was entering a hex number and let the a-f letters just work. I have a $12 calculator that gets that right. USB or sd card support would be nice, but not vital given that the programs aren't that big. I don't think huge programs are that important vs. the core engineering cases, although obviously there's a vocal group that loves extensive programs. I am the right amount of crazy; those guys are too crazy!
So in summary: I actually like this calculator. It's almost very good, but it's just got a couple baffling flaws. They did a nice job with the physical form and the feature set is near the sweet spot. The flaws just seem like bad decisions or they were in a rush or something -- not like it would have been a big added expense to get them right.
Now here's some free advice for HP management to make an additional billion dollars each year. I await my pallet of thank you gifts.
A high school or college student or engineer can bond with their calculator as the instrument at their side that they are using all the time through those hours of problems. That's why you see so many crazy people like me on the internet commenting on calculator details where any normal person figures .. who cares? Nobody bonds with an HP laptop vs. a dell or whatever. You can't really tell them apart in reality. But the calculator has a *physicality* ... you live with the buttons and the display and the interface so much going through that crucible, if the thing is built with conspicuous high quality and great design, it makes a real impression.
So here's the strategy: take $20m a year out of the HP marketing budget, and just spend it every year beefing up the products of the calculator division, and selling them at a premium, but still below cost considering the fantastic quality. It will be a covert form of marketing. Make physical forms that grow famous for indestructibility and 8 year battery life with intermittent use (that would be a neat sticker on the blister pack!). Think Maglite. The display and buttons should just be excellent in a way where a TI or sharp is obviously kind of lame next to the HP. The feature set does not need to be huge or the programmed loops fast, but (as above) the interface should be exhaustively researched and tuned, so the keystroke sequences just feel spot on. As a bonus, once you have the interface design well worked out, you don't need to change it a ton. The high end will be owned by computers and phones, so stick to the core math/engineering feature set and make it perfect (i.e. the hp50g market is not the future). Figure out an optimal form factor and button plan and stop messing with it. Don't shortchange the software to save 1000 bits on some chip .. the high quality software and design and its reputation is your expensive long term investment, and the chips will take care of themselves. Steve Jobs understands this.
Now in 5 years time, what you've done is produce this army of former students who have a strong feeling in their bones that HP produces high quality, well designed, jealousy inducing instruments. Imagine that as a holiday giveaway, every HP employee gets a calculator to keep or give to a neighbor or whatever, and they are honestly a little *psyched* about the gift as it is conspicuously and famously top of its class. It's hard to name an HP product like that today, because they're all on the economic margin. This trick works for HP, and not for Sharp et al, because HP has this ocean of high end gear to sell, and the little piddly expense of making over-the-top high-quality calculators is nothing compared to enabling a few more high-end sales. As a bonus, it provides the whole company something to be proud of. Windows laptops and printers are not lovable, or even likeable in the same way, but as mentioned above, I'm crazy!
1 of 1 found the following review helpful:
almost right Aug 14, 2010
I bought this to use instead of my 41CV. I found there were things I really liked and things that irked me.
Liked:
Complex number support - there is a lot you can do with this. A lot of the built in functions (eg e^x) work with complex numbers.
Fractions - surprisingly useful with household projects. The metric conversion stuff is useful and easy too.
General look and feel - feels like an HP calculator. I prefer the portrait mode calculators (like hp41cv) to the landscape mode ones (hp-15c).
Irked me:
I use base arithmetic and logic functions a lot at work. HP needs to make these more convenient. The method of entering hex and binary numbers really bothered me. You put the calculator in hex mode (fine), then key in the number, then you have to terminate the number with an 'h' - why? you are in hex mode, it should be understood that the number was hex. Similarly, you have to go through a menu to access the logic functions. Probably better to assign these to keys than some of the programming related functions (which are less frequent and could be accessed through menus).
Functions like e^x should be paired with their inverse on keys when possible.
THE BIG ONE - why on earth is there no slot for an SD card or even a USB port???? Think about the possibilities - you could have external application development software. You could store programs and data. If HP is really on the ball, they would add these, and open up some of the internals to let people develop third party software.
All this said, this is easily the best calculator out there right now. It is RPN (way better for serious use than algebraic). It doesn't have silly features like graphing (who wants to look at the graphs on screens the size of credit cards anyway) and is definitely on the right track. With a re-spin, it could be perfect.
1 of 1 found the following review helpful:
Excellent, But there is Room for Improvement Aug 11, 2010
I have upgraded from an HP 11c Scientific Calculator to the HP 35s Scientific Calculator. Here is my impression of the 35s after nine months.
PROs:
Visually, I think the 35s is a good looking product. The keys are thoughtfully organized and well labeled. The quality of the key labels is excellent and should last a lifetime. The tactile feel of the keys is excellent. The mathematical feature set is very rich and very impressive. The key-stroke sequence needed to make a calculation is well-done and good as can be expected.
CONs:
The display is the primary problem with this calculator. The display is low resolution--too low for today's standards. The display is highly-reflective and interferes with viewing its numerical images. The numerical images on the screen have a shadow, so when your eyes are not perpendicular to the surface of the display, this shadow will grow as the angle increases; this makes the numerals and symbols appear fuzzy. The bezel for the display will partially block your view of the bottom line in the display, so you need reposition the calculator to see it. The display surface is parallel with the top surface of the calculator, so this design increases the light reflection and bezel blocking problems. Some keys were not as responsive as others; however a call to HP tech support quickly resolved the matter. The key problem was due to some static electrical buildup in the keys, and was easily discharged by replacing the batteries with coins for fifteen seconds. This was not a chronic problem, but I was advised that electric fields (not from the calculator) may have created the buildup. The secondary problem with this calculator is it's inablity to perform some calculations, like the square root of negative one and trig accuracy. An individual who identifies himself as "123infinity" has performed some torture tests on it that go into detail. For his review you'll have to visit HP's website.
My wish list for this calculator:
Improve the display. Offer a printed version of the manual for purchase. Offer a soft slipcover as an alternative to the large hard storage case. Reduce the longest physical dimension of the calculator by 10%. Tilt the display towards the user.
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