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| Brand: Hewlett-Packard
List Price: $59.99
Buy New: $49.76
You Save: $10.23 (17%)
New (28) from $49.76
Rating:  107 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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| Customer Reviews:
Showing reviews 6-10 of 107
Almost but Not Quite Yet August 24, 2007
Richard H. Wood (Reno)
22 out of 24 found this review helpful
The HP 35S is inntended to be a tribute to the original HP 35, the first hand held scientific calculator, introduced 35 years ago.
The new calculator is IMO a huge improvement over other recent HP calculators as the keyboard is much more readable and the display contrast is excellent, with adequate size radix indicators. The keyboard has good tactile feedback in the classic HP tradition. The current units cover window on the LCD is very reflective however and needs improvement.
It has 32K of memory, more than adequate for this class of programmable calculator without any external program storage capability or computer hookup ability for program upload and download.
Program structure is directly descended from the HP 32s which places considerable limits on the number of programs that the calculator can hold and prevents giving them longer than single letter names. Program execution speed is about the same as the HP 42s by my testing, adequately fast but not a speed demon. I was personally hoping for program structure closer to that of the classic HP 41C and 42s units.
At least one minor bug has shown up with obtaining the Cosine of angles >= 89.999 degrees but < than 90 degrees. It is a loss of accuracy in the last 3 or so digits of the answer compared to the correct answer. Also no rectangular <> polar conversions are included.
Overall though in RPN mode the unit is the best true RPN Scientific calculator that HP has offered since the HP 32sII and 42s IMO. I am hoping it will eventually be the basis of an upgraded unit that is closer to the 42S in functionality.
I note a couple of reviews have errors in that they do not differentiate between HP's RPN and RPL calculators. ALL RPN calculators will give a different answer to 2 Enter 3 + (5) than they will to 2 Enter 3 Enter + (6) with answers shown in parenthesis. This dates back to the original HP 35 (First RPN) and 28C (First RPL) as I still have one of each in operating condition and checked this.
RPL has an input buffer and the examples given above will both give the answer "5" as the Enter before the "+" moves the input value from the input buffer to the lowest stack location, clearing the input buffer. "+" in RPL will either add the two lowest stack locations or the lowest stack location and the input buffer if it is not clear.
In RPN the Enter duplicates the value in x (the bottom stack register) into the next stack register and + always adds the first and second stack registers. Numbers are input directly into the lowest stack register in RPN calculators.
I own about 15 HP calculators from the oldest to the newest and ALL of the RPN units work one way and the RPL units work the other way.
An RPN Lover
Welcome back HP September 29, 2007
Sidney Cave (Orlando, FL)
22 out of 22 found this review helpful
I have been using HP's low to mid priced calculators since I bought an HP21 back in 1977. HP lost its vision in recent years with their calculators, abandoning RPN in their lower priced models and producing disasters like the HP6s and the HP33s. The HP35s is a definite sign of improvement. In spite of the gripes I list below, I consider this a good calculator I look forward to the HP35sII.
What they got right:
Good physical design, with good key lettering and key action. Not like their recent designs that are about style instead of clarity and ease of use. Similar to some of HP's older (and better) calculators. The key action is still not quite up to my favorite, the HP32s.
Errors:
The values for COS and TAN calculations near 90 degrees are incorrect in the last few digits.
Deficiencies:
The exponents of displayed values are off screen when the DISPLAY mode is set to ALL or using "ENG ->" or "<- ENG".
You must use 3 keystrokes to enter "h", "b" or "o" after non-decimal number entry. You should NEVER need to do this to any number being entered in the base of the selected mode. I can see were it would be handy for entering nummbers in an alternate base, but only then.
Keys for hex digits A through F are unlabeled in RPN mode and require two keystrokes in algebraic mode - bad design.
The thousands separators do not appear during digit entry; only after ENTER or an operation do they appear. This worked on older HP calculators.
 Disappointing--Too Many Failings August 28, 2007
Charles (Santa Cruz, CA USA)
20 out of 55 found this review helpful
I had high hopes for this calculator, but now that I have it in my hands I'm quite disappointed.
1. The keys are mush. This is a major failing. The tactile response of the keys on HP's professional calculators has always been an important aspect of their ease of use. The HP 35s, however, has mushy keys no better (and maybe worse) than cheaper scientific calculators from Casio or Texas Instruments. Incompetent design at HP now seems to be the norm in their calculator division.
2. The calculator is too wide and badly shaped to comfortably hold in the hand. It's deceptive in photographs, but the 35s bulges slightly towards the middle. This makes is slightly wider than my 48G, which is a big graphing calculator. The 35G feels unwieldy even though it's advertised as a pocket calculator.
3. It uses non-standard batteries. My 48G uses standard AAA batteries, but the 35s uses button batteries that you'll have to hunt for to replace. This is a poor decision on HPs part, creating another hassle in addition to the poor ergonomics.
4. The RPN entry is implemented incorrectly, and it is inconsistent with other HP calculators. This is insane. If I type 3 ENTER 2 ENTER + on my 48G then I get the answer 5, which is correct. If I type that in on the 35s I get the answer 4! Why? Apparently when I enter the number 2, it keeps two copies in the number: it moves a two into the register but doesn't remove it from the entry line so it ends up adding 2+2 instead of 2+3. This is absurd, confusing, and will lead to wrong calculations. It's inexcusable that HP would change it's implementation of RPN between scientific calculators--same company and same product line! I guess they're trying to compete with Microsoft in being hostile to users.
5. The display is of poor quality. The numbers are chunky and pixelated, and with better design HP could easily have fit a 3-line display on the 35S. My 48G displays 3 lines in the same space as the 35S displays two, and the display on the 48G (over ten years old!) is sharper and easier to read even though the numbers are slightly smaller on screen. The 35S looks like a digital photo magnified beyond what the resolution will bear. This is 2007: I can get a cheap MP3 player with a better screen than this. Designing a good LCD screen is not rocket science, but the incompetence at HP is profound.
I'll probably keep the 35s since I need a calculator in my home office, and I don't want to spend the money on another HP graphing calculator. But the 35s has little to recommend it, and considering all of HP's hype about commemorating the heritage of their scientific calculators, the 35s is a travesty. HP should be ashamed, and the 35s deserves to fail in the market place. I'm disgusted with what they've produced compared to what they could have produced.
 Programmers & software/firmware engineers beware! January 30, 2008
R. Wilder
20 out of 21 found this review helpful
HP 35s
Programmers & software/firmware engineers beware! If you do any base conversions and arithmetic please read this before considering this otherwise worthy calculator. In *all* previous HP calculators to do say hex addition (Ex: 12F + E9A) you'd simply do this:
1. Select hex mode: SHIFT BASE HEX
2. Enter the first number: 1 2 F ENTER
3. Enter the second number: E 9 A
4. Press + (total 11 keystrokes)
Not so with the 35s! Here's the drill straight from the example on page 11-5 of the manual
1. Select hex mode: SHIFT BASE HEX (so far so good...)
2. Enter the first number: 1 2 1/x SHIFT BASE 6 ENTER
Explanation: Although there's a key labeled "F" you don't use that one when entering hex numbers - you use the 1/x key to enter F!!! After you key in the hex number you still have to tell the calculator you've entered a hex number (even though you're in HEX mode (WHY??)) by pressing the sequence SHIFT BASE 6 - that puts a lower case "h" after the number.
Continuing on:
3. Enter the second number: y^x 9 SIN SHIFT BASE 6
4. Press + (total 17 keystrokes!!!!)
So the 2 main questions are:
1. Why use the SIN, COS, TAN, SQRT-X, y^x and 1/x keys to represent the hex digits A, B, C, D, E and F when there are keys on the calculator labeled "A", "B", "C", "D", "E" and "F"?!?!?!?!?
2. Why do I have to tell the calculator that's currently sitting there in HEX mode that I've entered a HEX number?!?!?!? In fact if I key in a hex number that contains an alpha digit and press enter I get "SYNTAX ERROR"!!!
So in a nutshell - If you're looking for a calculator do to base conversions and arithmetic even occasionally this is *definitely* not for you.
 Not the same as the original HP calculators August 21, 2007
Robert M (Washington, D.C.)
19 out of 43 found this review helpful
If you're like me and have "grown up" on HP calculators and were think "This is it! HP is back!" let me be the first to tell you that, no, HP is not back. The calculator feels a bit more fragile than the earlier generation and is missing some of the well thought out HP calculator innovations that the earlier alphanumerics, such as the legendary HP-41, hhad. The display does not show the function key you pressed unlike the HP-32s I own. Better yet the HP-41 showed the function and if you made a mistake in hitting the wrong function key, you simply held the key down for 2 seconds the function was nulled.
UPDATE: Day 2. Now the calculator has hung-up with SYNTAX ERROR. I tried all the obvious keystrokes without resorting to the manual to no avail.
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