HP 35s Scientific Calculator | 
| Brand: Hewlett-Packard
List Price: $59.99
Buy New: $49.76
You Save: $10.23 (17%)
New (30) from $49.76
Rating:  110 reviews
Media: Electronics
Autographed: No
Memorabilia: No
Shipping Weight (lbs): 3
Dimensions (in): 6.2 x 3.2 x 0.7
MPN: F2215AA#ABA
Model: F2215AA#ABA
UPC: 883585142859
EAN: 0883585142859
ASIN: B000TDRHG8
Availability: Usually ships in 1-2 business days
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| Features:
| • | Robust and economical scientific calculator | | • | 100+ built-in functions; 30 KB memory with 800+ registers | | • | Supports RPN and algebraic data entry | | • | 2-line, 14-character display | | • | 1-year limited manufacturer's warranty |
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| Editorial Reviews:
Product Description
Get professional performance with the HP 35s Scientific Calculator. Professionals and college students will appreciate the flexibility no other scientific calculator can offer, with the choice of RPN or algebraic entry-system logic. Switch between RPN and algebraic entry-system logic at any time. Save time with an impressive array of programmable scientific functions. The HP 35s delivers a large 2-line alphanumeric display with adjustable contrast, raised edges to protect the keys, and a robust library of built-in functions and constants. Large 2-line display with adjustable contrast to easily view entries, results, menus and prompts Simplify physics with 42 built-in physical constants, plus a complete library of unit conversions Get accurate results with edit, undo, delete capability Enjoy its compact size and protective raised edges that are designed for the mobile professional Use strong statistics functions for single and two-variable statistics, linear regression and more Use base-n functions for binary, octal, decimal and hexadecimal number calculation and conversion Perform operations on complex numbers, calculate logarithms, exponentials, inverse functions and more Take advantage of a powerful fraction mode plus fraction-to-decimal conversion Programmable with keystroke programming Durable design with raised edges to protect the keyboard, and includes a premium carrying case Dimensions - Length 6.22 x Width 3.23 x Depth 0.72 (15.8x8.2x1.82cm) Weight - 125 grams (4.4 ounces)
Amazon.com Product Description
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.
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| Customer Reviews: Read 105 more reviews...
 Best Scientific Calculator Available Today September 5, 2007
David Simpson (Laurel, MD USA)
70 out of 71 found this review helpful
This is a very nice high-quality scientific calculator from HP. The overall design and capabilities are similar to the HP 32SII (equation solver, unit conversions, etc.), but with several enhancements.
Like many recent HP models, this calculator can work in either RPN or algebraic mode, but I use only RPN. The keyboard layout has been well thought out, with most functions being quickly available directly from the keyboard and a few lesser-used functions available through menus. The keyboard has a traditional HP layout and colors, and the keys have a nice positive feel. A very thorough and well-written printed manual is included.
A new feature with this model is that each level in the four-level stack may hold a real number, complex number, or 2- or 3-element vector. Complex numbers may be entered very simply using the "i" key (or "theta" key for polar form); vectors are entered using square brackets. This design makes it very easy to manipulate complex numbers and vectors.
The calculator includes 30 kB of memory, which is enough for over 20,000 program steps. There are 26 main memory registers (A-Z), six statistical registers, and 800 more memory registers available through indirect addressing. Another new feature of this model is TWO indirect registers, (I) and (J).
A few cons: With previous HP calculators, there was a shortcut for entering exact powers of 10: for example, 10,000 could be entered as "E 4". For some reason HP has dropped that feature on the 35S, so you now have to enter "1 E 4". Not a major drawback, but kind of annoying since I used that shortcut a lot on previous models. Another nit is that the function to convert HMS to decimal hours is labeled HMS-> instead of ->H, which I haven't gotten used to yet.
Overall, the HP 35S is a very well-designed calculator, and I would not hesitate to recommend it as the best general-purpose scientific calculator available today. In fact, I bought three (for home, work, and school).
very good, but some room for improvement January 16, 2008
StevieQ (Castro Valley, CA United States)
63 out of 63 found this review helpful
I am a diehard RPN and HP calculator fan. I bought this calculator for the PE exam. HP calculators I've owned include HP41c, HP42s, HP12c, HP17BII, HP19BII, and HP33s. The HP35s is basically an HP33s with most the ergonomic design flaws and quality issues of the HP33s fixed, along with a few added enhancements. It's what the HP33s should have been in the first place. But, along the way, it also introduces a few design flaws of its own.
Obvious pluses: The keys on the HP35s feel almost like the ultra high quality keys on the HP41c, not entirely there because the ones on the HP35s are flatter and have less travel distance, but very close. However, unlike those on the HP41c, some of the secondary colors on the keys are only painted on. How long would the paints last? It comes with a super nice semi-rigid vinyl case. The LCD display is fragile, but it seems to be dust-proof and has excellent contrast. The built-in metric/imperial conversions and constants library are also nice. One major enhancement over the HP33s is the ability for a program to refer to a line number instead of a label name during conditional branching. This feature allows the writing of programs that don't use up a lot of the precious program labels. The equation solver is quite powerful. It comes with built-in equations for solving 2x2 or 3x3 simultaneous equations.
Obvious minuses:
There are only 26 single alphabet program labels and only 26 variables, severely limiting the number of programs one can store, considering the somewhat large 30kB memory available(the HP42s only has 8kB). The manual has a good number of useful programs, but in reality one can store only a few of these programs on the calculator at a time due to the 26 program label limit. I can store more programs on the HP42s even though it only has 8kB of memory. In actual use, most of the 30kB on the HP35s will go untapped.
It's a shame HP chose not to include multi-letter alpha-numeric capability as they did on the HP41c and HP42s. Instead of labeling a program that calculates the time value of money using a single letter such as "T", I'd much rather be calling the program "TVM" or "MONEY" or something easy to remember. The same one-letter restriction applies also to variable names. The listed battery life is on the short side. Two hours of use per day will last the batteries only about 9 months.
Whereas the HP42s offers four types of curve-fitting and has capability to choose one with the best fit, the HP35s offers only linear regression. Also, unlike the HP42s, the HP35s doesn't have any built-in matrix capability to evaluate determinants, inverses, although it does have built-in 2x2 or 3x3 simultaneous equation solving ability as mentioned earlier. You can program all these missing capabilities in but you'll use up many of the precious 26 program labels in a hurry.
The STO key which I use very often is now subordinated, requiring a shift key, whereas the "Mode" key which I seldom use is primary.
The display has much more glare than other HP models I've owned.
Although I will almost never use the algebraic mode except when writing equations, I must mention that its implementation on the HP35s is clumsy. On other algebraic calculators I grew up with, the number precedes a function key (such as COS, 1/x, log) and the function is executed as soon as the function key is pressed. In other words, even though they are algebraic calculators, their function keys work in postfix or RPN mode.
The key sequence is
45
COS
The value of 0.707 is displayed as soon as the COS key is pressed. It's very simple and intuitive. This is also how the functions work on the HP33s. But, surprise, this ain't how it works on the HP35s!
On the HP35s, you have to start by first pressing the function key and then punch in the number and then press the Enter key to get the value.
The key sequence is
COS
45
ENTER
The ENTER key works as the equal sign key in algebraic mode on the HP35s. Hitting the ENTER key now becomes mandatory to get an answer from just about any operation. Although this peculiar algebraic approach may make sense when writing equations, it's highly cumbersome when doing calculations on the fly, especially for someone used to the keystroke efficiency of RPN.
I sometimes scratch my head trying to figure out why for the last 10-15 years HP kept churning out mediocre calculators, with each new one worse than the previous one. Why mess with winning designs and dumb them down to the level of TIs and Casios? Yes, the money is where the masses are and the masses are the high school and college crowd and they use predominantly TIs and Casios. Then it dawned on me that the sales execs, designers, programmers, engineers also have to somehow justify their existence by rolling out new models and discontinuing older but superior models. The HP35s seems to be a step to halt the march toward mediocrity. Does it succeed? Yes, mostly. Although the build quality is good, it certainly could have been designed better.
Even though the STO key is now subordinated, the HP35s fills the need for basic everyday number crunching due to its ergonomic form factor and ease of use combined with a reasonably rich set of functions. The HP50g fills the need for heavyduty scientific/engineering use but is too clumsy for everyday basic number crunching.
I'm sure as I use this calculator more, I will see more of both the pluses and minuses. And, if I were to rate this calculator in comparison with any Casio or any TI, I would give it 10 stars if I could. But I rate it in relation to what I expect an HP calculator should be and so I rate it 4 stars. If the HP35s came with more program labels and variables than just 26 of each (A to Z), multi-letter alpha-numeric data entry capability, matrix capability up to [5x5], 4 types of curve fits and best of fit, primary STO and RCL keys, I would rate it 5 stars.
Not a bad calculator, for a change October 16, 2007
Bob Manson (Berkeley, CA United States)
38 out of 38 found this review helpful
The 35s is the most interesting calculator HP's produced in a while. While I'm sure their intended market is the legions of dedicated HP users, even if you're not a lover of antiques you should give it a look.
A definite improvement on the 32sII, and in general I would recommend it over purchasing an overly-expensive used HP. While the hardware isn't quite as nice the 35s should have a much longer battery life, and has more than enough memory to hold any reasonable number of programs.
It's physically larger than a 32s and it's not really "pocket-size". Yet it's not that big compared to modern scientifics and the larger display is worth it.
It feels very solid, except for a battery door which pops off a bit too easily. Lithium coin batteries are so much easier to deal with than watch batteries that I'll happily accept the tradeoff.
The keyboard is slightly soft compared to older HPs but that's been easy to get used to. It has a definite click, good-sized keys with a large Enter key, and should seem quite familiar to HP users. Unfortunately it uses painted-on key symbols which I suspect will show wear rather quickly.
Crisp display, easily readable from practically any angle. A huge improvement over the LCDs in HP's older models.
It has RPN and algebraic modes, as well as an EQN key which allows algebraic entry while in RPN mode. Most keyboard functions have an EQN/ALG counterpart, and while algebraic formulas can be used in programs you'll still need to use RPN for conditionals and loops.
The excellent mixed-base number support is a pleasant surprise. In algebraic mode you can easily enter a calculation in mixed bases without changing the current base. (This mostly works in RPN, but there's no way to enter hex A-F without switching modes.)
Programming is similar to the 32s and much of the manual is identical--the only major change is additional memory. The 35s' overloaded keys and simple design make programming much easier than an RPL-based calculator like the 49g+.
Why did it only get 4 stars? Two issues:
No I/O. Being able to backup memory would make me a little happier and I've come to expect this from a modern programmable.
And, RPN programs generally run only about as fast as on the 32s, making its programmability less useful than otherwise. After 15 years I expected to see at least a factor of five speed increase.
In short: I like it, and I think you will too. In terms of price and ease of use it can't compete with, say, the Sharp EL series. (The new HP 10s is a real contender there.) But the HP 35s' programming capabilities set it apart from any of the inexpensive scientifics. If you'll take the time to learn RPN, you'll find writing programs is easier and more convenient than writing the same thing in a BASIC-like programming language.
RPN is standard August 29, 2007
Douglas Dobbin (NM, USA)
30 out of 33 found this review helpful
Tim C is as confused as Charles and is unable to spell my name even though it is printed in the review. I am holding an original HP-45 in my hand. If you type 2 Enter 3 Enter + you get the incorrect answer 6. Tim C's claim of an "error" in HP's implementation starting at the HP-32SII is completely false. I own an HP-32SII also. It works exactly the same way as the HP-45 which predates the HP-32SII by 18 years. I know what I am talking about. I own and use the HP-45, 55, 67, 29C, 41CV, 41CX, 48GX, 49G, 50G, 32SII, 42S, 28S, 50G, and 35s. I guess I need to repeat myself: ALL EARLY HP RPN CALCULATORS REQUIRE THAT YOU PRESS 'ENTER' ONLY ONCE. THE HP-35s FOLLOWS IN THIS TRADITION! Tim C should learn the history before he comments on it. Tim C should buy and use the product before he writes a review. The reviews by Charles and Tim C are misleading. Reviewer Charles has limited experience with RPN and has not explained it correctly. In general you should only have to press Enter once during a calculation with 2 numbers. This is true of the 48G also. Some calculators have a command line at the bottom that is separate from the x,y,z,t stack. For those you MAY press Enter twice but you don't have to. 2 Enter 3 + will work fine. On all the older RPN calculators you enter numbers directly into x and you should not press Enter twice. Again: 2 Enter 3 + will work fine.
nice, nostalgic and useful August 14, 2007
Harry Pandolfino (York, PA USA)
26 out of 34 found this review helpful
The 35S is a retro commemoration of HP's history with the digital calculator. The black case and bevelled buttons are meant to hark back to those fondly remembered legendary early models which dazzled when they first came out. The 35S is also intended to address some of the peccadilloes that users complained about with the 33S. For those who balked at the crass silver case of the 33S, it's slanted buttons and its issue with the display, the 35S is the cure. The 35 packs a few more features as well.
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