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HP 35s Scientific Calculator | 
| Brand: Hewlett-Packard
Department: Electronics
List Price: $59.99
Buy New: $39.99
You Save: $20.00 (33%)
Rating:  203 reviews
Format: CD
Platforms: Windows XP Professional, Windows XP Home Edition, Windows 2000
Media: Electronics
Autographed: No
Memorabilia: No
Number Of Items: 1
Operating System: N/A
Shipping Weight (lbs): 3
Dimensions (in): 6.2 x 3.2 x 0.7
MPN: F2215AA#ABA
Model: F2215AA#ABA
UPC: 883585142859
EAN: 0883585142859
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:
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.
Product Description
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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| Customer Reviews:
Showing reviews 1-5 of 203
 The only RPN calculator left. They made it well. July 24, 2010
Jim Gerdy (Chicago, IL)
I have been using RPN calculators about as long as I have been using calculators at all. I learned RPN on my father's HP-45 and used 10-series and 48-series and emulators on computers whenever I need a calculator. RPN, of course, is the way to go for speed and simplicity. Unfortunately it seems to be declining in popularity (and never was that widespread to begin with).
HP's calculator division is legendary from producing the first handhelds HP-35 and HP-45 in the 1970's to their LCD models in the 80s (all the way up to ending production on the HP-48 in 2001). The division even produced the HP95LX, 100LX, and 200LX in the 1990s, a full 80186 DOS computer with an RPN calculator available by a hotkey.
All together these are the best calculators since the Dietzgen slide rules. Compared to the competition they are not only better to use and better featured, they are higher quality build and last far longer. In fact all of my now vintage calculators, going back to my 1981 HP-15C, still work (and self-test) flawlessly.
It's because of this high quality standard that I recently bought the relatively inexpensive HP 35s. The vintage calculators sell for very high prices (hundreds of dollars) so I no longer carry them around. 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 days. It's an improvement pretty much all around. I would cite a few flaws. In my opinion HP weakened their only scientific RPN calculator with:
1. wasting some key real estate on silly conversions like temperature and liters to gallons
2. no polar or rectangular mode
3. there is an equals sign and algebraic mode (At least that allows HP to address two markets with one product.)
4. there is no connectivity to a computer (The vast amount of memory allows for extensive programs which could benefit from a better way to control the code, such as a full computer.)
Nevertheless this is a scientific RPN calculator made in the HP tradition. It has the look, feel, and build quality of their legendary calculators of the past. I enjoy using it and would recommend it to anyone who wants the best scientific calculator in current production.
I love HP with RPN July 20, 2010
L D
I work as a Machine programer and got my first HP RPN hand held when I was 19 years old and I'm 56 now and love the HP35S.HP 35s Scientific Calculator
Updated HP Classic July 6, 2010
Willam J. Edwards (Hixson, TN USA)
All HP users that rely on RPN need to have his one. This is an updated version of the original work horse. Great job HP! I absolutely love everything about this calculator. This calculator is on a list of acceptable calculators for taking the PE exam and I was not in the market for another HP, however, I am glad I bought it. The price was right too!
HP35s review June 29, 2010
Jack Korossy (MENTOR, OH, US)
The calculator looks smart, is efficient in performing its job and continues HP's well established reputation.
 HP35S versus HP32SII no contest! June 26, 2010
B. Mcdaniel (Southern California USA)
I have used a HP32SII for nearly all of my work / studies as my go to calculator. HP32SII = 6 stars. Since I cant get a HP32SII (for a sane price), I grabbed the HP35S as an RPN scientific calculator for limited engineering uses around the house so I can leave my HP32SII at work. The ergonomics and construction, are 90% of a good calculator, and the HP32SII is the cream of the crop. As I write this review, I have both the HP32SII and the HP35S in front of me.
I echo the sentiments of many reviewers, dissatisfied with current HP calculator products. HP would do well to revive the 32SII, in its mid 90's embodiment, as a dedicated RPN engineering calculator. A lot of technical types would pay a premium for that. I recognize the HP32SII is older and this comparison is not really 1:1 in terms of feature density, but the HP35S is the closest thing to the HP32SII that HP has offered since the "precious" was discontinued.
HP35S Physical Properties vs HP32SII:
-Longer (~.5")
-Wider mid body(~.125") same at top and bottom.
-Thicker (~.0625" at bottom & ~.125" at top). It sits angled. With battery cover off its ~.0625" thicker top and bottom.
-Lower weight
-Keys: 4 in cross pad + 39 main keys (43 total); 37 total no cross pad for HP32SII.
-Keys are ~20% larger having flat top & angled edge instead of rounded arc shape on the 32sII. Blue 2nd functions are printed on angle part w/memory letters in red.
-Screen is shinier and more reflective. Its distracting. Screen appearance is not as crisp or visible. Numbers on display are slightly smaller and narrower.
-The numbers are closer to the bottom edge of the display. The small gap makes the display feel confined.
-The cursor blinks; solid on the 32SII
-The display is two lines vs 1. I am not sure what the second line really shows...its an odd mix...it does not really show the classical RPN "stack" or the last # "entered".
-The display is 14 numbers wide now; 12 on the HP32SII
-The key feel is not as solid or positive. This is a combination of button feel, frame flex, and foot pad softness. Net result is button use causes the entire calculator to "squish" down more giving a softer less positive key feel
-Rubber skid feet are softer & taller. Does not slide away on key entry as easily as HP32SII. 2 rubber nubs are on the battery compartment cover and cover movement adds to overall flex.
-The battery cover door is about as big as a sheet of plywood and is not solidly attached. Using the calculator w/the battery door removed improves the key feel.
-Key pushes make more noise.
-When put down on a desk, it sounds hollow/rubbery. Its spongy when you set/move it around on a desk
-The adjustment range of the display intensity is smaller and increments are finer. It seems the dimmest setting is also dimmer. Overall dimmer appearing display.
-Dedicated reset button on the back you push w/a paper clip VS. simultaneously pressing C, SQRT, and Sum+ buttons.
-Came w/a case. A folded in half sheet with elastic side strips. Its hard to slide take off.
-Product of China, previously Singapore.
HP35S Key Mapping vs HP32SII
-The keys are not laid out the same. Many differences & not better IMO.
-Previous "blue" 2nd functions are now on "yellow orange" 2nd functions and vise versa in some cases. Primary keys are now 2nd function and vise versa.
-In some cases a key's primary function does not have the inverse function mapped to the 2nd function for the same key
-The physical location of primary keys is not even close to the HP32SII primary key physical locations on the key pad.
-The conversion functions are not assigned to the same numbers as before, and there are changes in 2nd function assignment...what was previous blue or yellow orange 2nd function assignment is now opposite.
Some Specific Key Mapping Change hi-lights:
-Entering 2/3 as a fraction is now keystroke .2.3 and appears as 0 2/3 instead of the older 2..3 appearing as 2/3. The HP35S instructions suggest entering 2/3 with key stroke 0.2.3 Entering 5 7/8 as a whole number and fraction is keystroke 5.2.3 for both devices. Preferred the old way.
-Memory STO and RCL are now on the same key. Previously the STO and RCL buttons had a memory space assigned (G and H respectively) - no longer the case. The old way was faster / easier. This new memory input/access mapping basically sucks. They added 6 keys...why did this dedicated key have to go away?
-y^x does not have the x root of Y as the inverse function.
-Accessing the statistical entry is cumbersome with the physical movement of the SIGMA +, AVG, and STD DEV buttons to the bottom of the keypad. You have to take your eyes off the display to find the buttons, unlike before where they were right in your eye-line at the bottom edge of the display
-Accessing physical constant PI is now yellow orange 2nd function COSine key instead of the old blue 2nd function SINe key.
-In ALL display mode for long numbers it displays E or E- at the end but you have to use the right arrow cross pad key to get the power to display. Seriously.
HP35S math & RPN issues
-Couldn't HP get this right? It says scientific right on it...
-Previous comments about TAN function error close to 90 are correct. You decide if it matters for you. I am OK but, I sure dont like it.
-Previous comments about the summation issue 1+2+3+4+5+6+7+8+9=45 are true. I am not sure if this is a calculation speed or button feel/entry issue, but it is true. Slowing down and pushing harder helps prevent this.
-Previous comments about RPN change for square root are different for this model comparison: key strokes of 1 +/- sqrtX give the same display in both cases...SQRT(NEG) HOWEVER:
-The RPN is just plain wonky. Not at all like the RPN on the HP32SII which I am used to. RPN should be a core competency for HP by now.
-I fully expect other "anomalies" I have not identified yet.
Overall, the HP35S is suitable to augment my HP32SII for basic engineering efforts in the garage/shop - but its not a solid built replacement for first line use . Its better than the non-RPN offerings out there, or a cell phone calculator. The HP35S is not, in any way equal, to the HP32SII.
The 3 star rating is based on the HP35S's own merits (would be 2.5 stars if allowed). In direct comparison...it scores 1.0-1.5 stars in my book.
Amazon was awesome as usual. Sorry for the long review.
Showing reviews 1-5 of 203
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