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HP 35s Scientific Calculator

4.7 4.7 out of 5 stars 1,599 ratings

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Brand HEWLETT PACKARD
Color Black
Calculator Type Engineering/Scientific
Power Source Battery Powered
Screen Size 1

About this item

  • Engineering, Surveying, Science, Medicine, Display type: LCD
  • Adjustable contrast with 2 lines x 14 characters + indicators, 14 character dot matrix (5 x 7)
  • SAT Reasoning Test; SAT Subject Tests in Mathematics Level 1 and Level 2; ACT; PSAT/NMSQT; AP Chemistry/Physics; PLAN; EXPLORE
  • Dimensions (W X D X H): 3.23 x 0.72 x 6.22 Inch. Warranty: 1 year warranty (may vary by region)
  • Built-in functions: Over 100, Memory registers: 800, Memory: 30 KB, Power: 2 x CR2032 batteries; battery life: 0.73 year @ 1 hr/day (approximately 9 months)
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HP 35s Scientific Calculator
HP 35s Scientific Calculator
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PriceCurrently unavailable.$30.91-5% $144.99
Typical:$151.95
-43% $12.44
List:$21.95
-6% $19.98
List:$21.19
Delivery
Get it as soon as Sunday, Mar 17
Get it as soon as Sunday, Mar 17
Get it as soon as Sunday, Mar 17
Get it as soon as Sunday, Mar 17
Customer Ratings
Easy to use
4.6
4.2
3.8
4.6
4.3
Easy to learn
4.4
4.2
4.1
4.6
4.3
Easy to read
4.4
4.2
4.6
4.9
User interface
4.5
4.5
4.1
Value for money
4.4
4.7
4.0
Sold By
Amazon.com
SSL Unlimited
Amazon.com
Amazon.com
model name
TI-30XIIS™, Black
FX-991CW
power source
Battery Powered
Solar Powered
Battery Powered
Solar Powered
Solar Powered
battery quantity
2 c, 2 cr2, 2 lithium ion, 5 product specific
1 lithium ion
1 lithium metal, 1 cr123a, 1 cr5, 1 lr44, 1 c, 1 cr2, 1 a, 2 aaa, 1 lithium ion, 1 aa, 1 product specific, 1 unknown
1 lr44
display type
LCD
LCD
LCD
LCD
material
Plastic
Metal
Plastic, Metal
Plastic
style
EL-W516TBSL
Single Pack

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HP 35s Scientific Calculator


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Product Description

Product Description

HP 35s Scientific Calculator

Amazon.com

Ideal for college students, engineers, surveyors, and medical personnel, the HP 35s scientific calculator offers calculation versatility in one economical unit. For added versatility, the HP 35s lets users choose between RPN or algebraic entry-system logic (no other scientific calculator offers both). It also features a large, two-line alphanumeric display to view entries, results, menus, and prompts with ease. The display also sports an adjustable contrast feature, making it ideal to use both indoors and out. A robust library of 100+ built-in functions and constants also comes pre-loaded for immediate use right out of the box. A robust memory ensures even the largest calculations go smoothly and quickly, and more than 800 independent storage registers allow users to store an equation, then use it again to solve any variable, or employ the equation in conjunction with any of the 100+ built-in functions. The calculator is backed by a manufacturer's 1-year limited warranty.

What's in the Box
HP 35s scientific calculator, batteries, user's manual, and premium protective case.

Customer reviews

4.7 out of 5 stars
4.7 out of 5
1,599 global ratings

Customers say

Customers like the quality, performance, and ease of use of the calculator. For example, they mention it's durable, has very helpful features, and is easy to use. Customers appreciate the value, and appearance of the product. That said, opinions are mixed on buttons, display, and keys.

AI-generated from the text of customer reviews

373 customers mention283 positive90 negative

Customers like the quality of the calculator. They say it's a great general-purpose scientific calculator, durable, and accurate. It has a low power LCD and tactile feedback. Some say it has ed a high quality build and lasts far longer. Overall, customers are happy with the quality and functionality of the product.

"...Comes with an elegant, durable, double-zippered clamshell case (note: it's no longer included. It has been replaced with a vinyl slip case).*..." Read more

"...It sits nicely on the desk and the display is at the proper reading angle. It has solid rubber feet which stop it from sliding all over the surface...." Read more

"...and I would not hesitate to recommend it as the best general-purpose scientific calculator available today...." Read more

"...they are not only better to use and better featured, they are higher quality build and last far longer...." Read more

177 customers mention129 positive48 negative

Customers like the ease of use of the calculator. They say it's ergonomic, intuitive, and easy to use. The design makes it very easy to manipulate complex numbers and vectors, and it' s also usable for simple tasks like every day math. Some like that it switches from RPN to Algebraic notation easily, and that it comes with a quick start guide.

"...; The keys are responsive, the form-factor is comfortable and convenient, and the appearance is gorgeous, far superior to the toy like calculators..." Read more

"...This design makes it very easy to manipulate complex numbers and vectors...." Read more

"...Compared to the competition they are not only better to use and better featured, they are higher quality build and last far longer...." Read more

"...alphanumeric prompts for user input is a little cumbersome and unintuitive (you have to use equation mode), but it can be done...." Read more

175 customers mention151 positive24 negative

Customers like the performance of the calculator. They mention that it has some very helpful features, particularly the solver and the factorial function is available within programs. They find it easy to read and easy to find the functions. The alg mode works very well and has all the Log functions, trig functions, and inverse functions. It has a ton of very easy to use features, and can do RPN.

"...to my old HP22S in size and feel, while being far more powerful and having RPN...." Read more

"...I find the newer slip case to be sturdy and durable and works just fine and NOT to be a reason to avoid purchasing a 35s...." Read more

"...Overall I like this better than my 11C because it has some very helpful features, particularly the solver and unit converters, and I like it better..." Read more

"...The complex number support, a real core use case for engineers, works pretty well on 90% of the functions...." Read more

79 customers mention70 positive9 negative

Customers like the value of the calculator. They mention that it's not a bad price for a great calculator.

"...first scientific calculator ... the HP 35s is a great buy and relatively inexpensive compared to Calculators of this caliber over the past 20 years...." Read more

"...True, it's more lightweight and built on a budget, but the cost ($<60) is a tiny fraction of what those calculators cost, and those were pre-..." Read more

"...Cheers to HP for bringing out a low-cost, powerful RPN calculator.Best," Read more

"...stumbled apon the 35S. It looked better than the 32SII and the price was right!..." Read more

51 customers mention51 positive0 negative

Customers like the appearance of the calculator. They mention the overall design and look, the buttons and carry case, the old-looking design with a modern twist, and the face is made of metal and finished with a very light brushed look. The calculator comes with an elegant, durable, double-zippered clamshell case. The look and feel is very familiar, and customers appreciate the clear button labels. The physical aspects are well done, and they say the buttons click firmly. Overall, customers find the calculator to be a sweet collectible and useful.

"...For all these reasons it's a sweet collectible, in addition to being useful.The HP50g was released in 2006 and discontinued in 2015...." Read more

"...The Enter key is in the correct place (for me).* Comes with an elegant, durable, double-zippered clamshell case..." Read more

"...The leather cover looks really nice, but the slide on the TI is more convenient...." Read more

"...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..." Read more

108 customers mention75 positive33 negative

Customers are mixed about the buttons of the calculator. Some mention that the buttons have a great tactile feel and are clearly marked, while others say that they are like mush and take more button presses to do things. The right cursor button and the multiplication key do not work, and the yellow shift button does not work right.

"...It just "satisfies." The keys are responsive, the form-factor is comfortable and convenient, and the appearance is gorgeous, far superior to..." Read more

"...HP's legendary tactile key feedback is also good and keystrokes are not likely to be ignored...." Read more

"...The TI has many more functions than the hp 35S, but it takes more button presses to do things...." Read more

"...$55 MSRP.The calculator is solidly built and has a nice tactile response and is loaded with features...." Read more

83 customers mention41 positive42 negative

Customers are mixed about the display of the calculator. Some mention that the display is good, with the 2 line LCD display being an added bonus. However, others say that the product is made in China and the display could be better. Some customers also mention that it is annoying and the dot-matrixey display is not very useful.

"...This HP 35s is also an improvement, with a better display, faster processor, and far more memory than was available in the 10-series or 48-series..." Read more

"...The display is a little weird looking and takes some time to grow accustomed to. Overall readability is good...." Read more

"...It's a good size, has an easy to read screen and has great tactile buttons that produce a gentle click when pressed...." Read more

"...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..." Read more

83 customers mention31 positive52 negative

Customers are mixed about the keys of the calculator. Some mention they love the feel, the size, and the keys. The keyboard layout is generally good, and no extra keystrokes are required. However, some say the layout is poorer than any other "real" HP, and that certain keys are not primary. The key feel is a bit shaky, and it's possible to press a key but miss the keystroke. Other customers have noted that the key sequences are cumbersome, and they've missed keying in a digit.

"...Reviewers have pointed out how other keystroke sequences are cumbersome but being a scientific and mathematical ignoramus, I have not noticed..." Read more

"...The Enter key is in the correct place (for me).* Comes with an elegant, durable, double-zippered clamshell case..." Read more

"...A 4- or 8-character limit would be fine.* No ability to type in symbols for data prompts...." Read more

"...time, the user will be happy with what's displayed, and no extra keystrokes are required...." Read more

A great HP calculator with a few glaring problems
4 Stars
A great HP calculator with a few glaring problems
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 HP 15c 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 (I added a picture for the slipcase, and for fun, a picture in front of the HP garage). The 2-line display is nice, often allowing you to see what you keyed in and the answer simultaneously in alg mode. 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 a couple extra key strokes to see the result. 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 is also a disturbing problem with the trigonometric functions where they drop significant precision for cases near 90 degrees. For example tan(89.99999) returns 5,729,578.122 which is incorrect beginning at the 8, so 40% of the digits shown are wrong (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. What was HP thinking? 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 Kahan, a giant in the field of computer arithmetic, was hired by HP in the 1970's to fix problems with the transcendental functions in the original HP 35, and he contributed to the extremely accurate arithmetic for which later HP equipment became famous (see Kahan'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, famously, HP fixed the original HP 35.) The 35s trigonometric bug has been public since 2007, and there's 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 wonder if they are hitting a rare case where their calculator gets a lot of digits wrong.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 (as a bonus, it computes tan correctly). 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!
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Pelle Liljendal
5.0 out of 5 stars My favorite "bread and butter" scientific calculator
Reviewed in Germany on October 2, 2023
One person found this helpful
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Lilly
5.0 out of 5 stars molto constosa ma per me un regalo da favola
Reviewed in Italy on June 16, 2023
One person found this helpful
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David martinez
5.0 out of 5 stars buen producto
Reviewed in Mexico on August 1, 2023
Amazon Customer
5.0 out of 5 stars Great calculator for engineers
Reviewed in Canada on April 1, 2020
Rajiv Sharma
2.0 out of 5 stars Awful
Reviewed in India on April 26, 2018