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HP 35S Scientific calculator

The HP 35s get professional performance from this pocket-sized and programmable for students and professionals in mathematics, science, surveying, and engineering.2 years warranty and protective case included. Ultimate pocket size performer Professionals and college students have the flexibility no other scientific calculator can offer with the choice of RPN(Reverse Polish
Manufacturer: HP
SKU: 883585173785
£160.00 incl vat (£133.33 excl vat)
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Reliable performance and accurate results

The HP 35s delivers with a large 2-line alpha numeric 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 a compact size and protective raised edges

that are designed for the mobile professional

Power and functionality in one

Save time with an impressive array of programmable

scientific functions.

• 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

• Power to calculate inverse functions, cube root,

logarithms, exponents, factorials and more

• Take advantage of a powerful fraction mode

plus fraction-to-decimal conversion

HP quality and support

Have confidence that every time you turn on your HP calculator,

every calculation you make, results in dependable, worry-free

performance and accurate results.

• Rely on HP quality and award-wining support—

online and by phone

• Get the most from your calculator, visit

www.hp.com/calculators for downloads, tutorials and more

The HP 35s Scientific Calculator includes all the features

of the HP 30s plus:

• The choice of both efficient RPN and algebraic

entry-system logic

• Programmable with keystroke programming

• HP Solve application

• 31KB memory with 800+ independent storage registers

• 42 built-in physical constants

• Adjustable contrast 2-line display with menus,

prompts and messages

• Edit, undo, delete capability

• Enhanced fractions mode, statistics and mathematics

packages with base-n function

• Durable design with raised edges to protect the keyboard

and premium carrying case

HP Part Number F2215A

CPU SPLB31A

Display size 2 lines x 14 characters + indicators

Display Type LCD

LCD 14 character dot matrix (5 x 7) x 2 lines + indicators

Contrast Adjustable

Entry-system logic RPN & Algebraic

Built-in functions 100+

Menus, prompts, etc. Yes

Internal precision 15 digits

Pending operations 13-level parenthesis or maximum number of pending operation:

13 @ALG

Memory 800+ Memory registers; 31KB

Keyboard Alphanumeric

Power 2 x CR2032 batteries

Power off memory protection Yes

Battery life 0.73 year @ 1 hr/day (approximately 9 months)

Weight 125 g (4.4 oz)

Size (L x W x D) 15.8 x 8.2 x 1.82 cm (6.22 x 3.23 x 0.72 in)

Enclosure material Plastic, brushed metal faceplate

Key top material Plastic

What's in the box Calculator, batteries,  protective case

Warranty 1-year warranty (may vary by region)

Subject suitability Engineering, Surveying, Science, Medicine

Permitted for use on SAT® Reasoning and SAT® Subject TestsTM in Math 1 & 2, ACT,

PSAT/NMSQT, AP Chemistry/Physics, PLAN, EXPLORE

Products specifications
Key StagePost 16

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Product reviews

09/01/2024 15:36
Ekomi Review
I very much like the HP35s, especially the 2nd release (the one that has the clearly labelled yellow and blue shift keys on the left). best calculator they ever made for an engineer, architect and surveyors- my opinion - does it all, except it too can't seem to do calculations in other than the decimal system with fractions ...Anyway I got it fast in a sealed package / new and for a good price in regard to the competitioners. Some of them charging 2 1/2 times as calculators.direct because HP35s is discontinued _ I think since end of 2021.
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12/12/2023 15:29
Ekomi Review
Excellent service from Calculators Direct, even though they have asked me to review a Texas Instruments calculator and not the HP35S I actually bought.
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04/05/2023 11:59
Ekomi Review
HP 35s. The best scientific calculator with RPN from HP still available. Unfortunately, it is no longer produced. Thanks to Calculators Direct for still being available.
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25/02/2023 17:04
Ekomi Review
After nearly 50 years, my HP45 has at last given up the ghost.  Its battery packed up long ago, so I have been using it plugged in - now it's developed a faulty connection and keeps switching off.
The HP35S takes a bit of getting used to, because its keys are in different places and more extensive than for the HP45, but I am gradually expanding my repertoire.
It's good to have a slimmer build  than the HP45, it's quite sturdily built and for me it's now portable - no mains flex.
This one will see me out and I can recommend it to all scientists and engineers.
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06/02/2023 18:40
Ekomi Review
Engineering / Scientific calculations
Engineers / Scientists
Excellent build quality as always with HP
Was this review helpful? (0/0)
06/02/2023 17:54
Ekomi Review
Excellent product and very pleased to find it at a reasonable price.
One comment: I don�t think I received any email acknowledgment when I placed my order. This is helpful to avoid concerns, particularly when using a site for the first time.
Shipping, tracking guidance alert we�re all great.
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23/01/2023 18:02
Ekomi Review
HP inverse polish calculators are the best for structural engineers.
Was this review helpful? (1/0)
03/12/2022 16:45
Ekomi Review
HP32 S is an excellent top quality calculator upgrade from my previous HP
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30/11/2022 08:29
Ekomi Review
Stress Analysis calculations
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27/11/2022 18:24
Ekomi Review
Good quality
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02/11/2022 18:44
Ekomi Review
I am preparing a Level-3 mathematics course for distance learners and use the calculator to evaluate and test mathematical equations. The HP 35S is a quality calculator designed specifically for science and engineering.
I have had the calculator for only a few days but am extremely pleased with my purchase. I have seen some YouTube reviews of the HP 35S most of which agree that it is a quality calculator. However, there are some negative comments to be heard which is surprising since I cannot fault it so far.
The buttons are a sensible size with a very responsive tactile feel. The display is a two line LCD with very good contrast. The case feels firm and well built and the protection pouch is firm but flexible with a soft lining. All in all, very good.
If you need a good solid calculator with Reverse Polish Notation for engineering work and do not need to show any graphs then this would be my recommendation.
The purchase was quick and simple from Calculators Direct. The price was fair. I purchased it on a Friday and it arrived the following Monday just 3 days later packed in an additional cardboard box for good protection. The calculator included the soft pouch, two button batteries, instructions in English and French and a CD for an in-depth instruction manual.
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01/11/2022 14:15
Ekomi Review
Nice RPN calculator.
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17/10/2022 18:34
Ekomi Review
Slow delivery!
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15/10/2022 12:04
Ekomi Review
The last scientific calculator with RPN from HP.
Must buy while available.
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10/10/2022 18:00
Ekomi Review
excellent calculator
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30/09/2022 19:52
Ekomi Review
Nice calculator
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01/08/2022 12:16
Ekomi Review
Good calculator for a reasonable price.
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02/07/2022 20:35
Ekomi Review
I am a great fan of RPN and my old HP35s recently died.  I had owned it for many years and was very pleased that you were able to replace it.
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21/06/2022 20:52
Ekomi Review
Excellent calculator, excellent service. Would mostly suit someone needing a programmable calculator.
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20/06/2022 22:55
Ekomi Review
I first encountered HP calculators and the Reverse Polish Notation system at a school 'Physics Club' in 1972, and I have been a fan ever since.  The HP was the calculator of choice in my college years, [there were just four of them, bolted to the desk in the Surveying Department!], and I have used them throughout the whole of my working career as a Civil and Structural Engineer.  The RPN and stack notation are still, in my opinion, the best for engineering problem solving applications.
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12/03/2022 20:27
Ekomi Review
General use - �fun� mathematical jobs, some programming, computer group demos etc.
I�d recommend to anyone who prefers/knows RPN
HP have always been high quality, but the build quality is lower these days- they are beaten by Swiss Micros products!
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19/01/2022 19:25
Ekomi Review
For work. This is an excellent calculator and my last one lasted 15 years plus before it stopped working. I only use RPL logic and find a normal calculator almost impossible to use. If anyone would like to use less keystrokes on their calculator and be able to do more complex calculations easily this is the calculator of choice.
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22/12/2021 10:41
Ekomi Review
For carrying out engineering calculations.
None that I could think of. Most of my old colleagues used algebraic calculators.
I don't think the quality of HP calculators nowadays is anything like HP calculators bought 40yrs ago. Usually the keystrikes begin to fail. I have probably had 4/5 HP35s over the last 10yrs.
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18/10/2021 14:55
Ekomi Review
I've used an HP 32S for nearly 30 years and loved it, but, finally, a couple of the keys didn't always register until pressed a second time.  Perhaps I could have opened it up and cleaned the membrane, but I thought it made sense to buy new.  I was delighted to find HP still makes an RPN scientific calculator, so now I have the 35S.  It has way more computing power than I'll ever need, but it's nice to have.  First impressions of the style, size and build quality are first class.  But what a pity it doesn't come with a full, hard copy user manual.  I would willingly pay a lot extra for this.
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24/07/2021 15:27
Ekomi Review
Great HP classic calculator - nothing like them! Recommended for the RPN functionality and build quality - nearly indestructible.
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22/05/2021 15:17
Ekomi Review
Excellent build quality but user guide comes on CD showing the age of the product.
Hopefully will be the last calculator I ever buy.
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05/05/2021 08:42
Ekomi Review
Good quality product with good quality feel to the keys. Has all of the scientific functions you would expect. I am yet to use the programming functions. I'd recommend it to engineers and scientists, and students if they can afford it.
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03/05/2021 12:42
Ekomi Review
Used for engineering design, all technical activities, quality good but not as good as my 11C. Also my instruction manual is in French? If CE marked for sale in UK must be in English. CD included but I have no way of accessing it old technology now. Can you send me English instructions.
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29/03/2021 10:31
Ekomi Review
Super item , all engineers should have one
Was this review helpful? (1/0)
28/08/2020 15:04
Ekomi Review
Calculator used for professional purposes. Oil & Gas design engineering.
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28/08/2020 15:04
Ekomi Review
I use it for navigation
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28/08/2020 15:04
Ekomi Review
I use it for structural engineering design i.e. complicated stuff and it's so much easier to use than non-RPN calculators. I think that I bought my first HP about 42 years ago.
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28/08/2020 15:04
Ekomi Review
Previously used the HP product for 20 + years. The old one finally broke  --  only because I dropped it
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28/08/2020 15:04
Ekomi Review
A good machine to have at hand in any engineering related field.\nSpecially aimed at HP nostalgics who don't want/need to carry the HP50g big guns everywhere.\nStill packs a lot of programming power.
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28/08/2020 15:04
Ekomi Review
Great quality product
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28/08/2020 15:04
Ekomi Review
In the absence of the HP 15C - a good alternative
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28/08/2020 15:04
Ekomi Review
HP calculators area must for me.
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28/08/2020 15:04
Ekomi Review
I bought the HP35s for myself because I wanted a programmable scientific calculator and I liked tithe early HP calculators. \nI did not need a graphing calculator.
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28/08/2020 15:04
Ekomi Review
Purchased because I've used HP calculators since college (1980) and now can't bare using anything else (RPN). Had 32e and still have 32sII so can have a good calculator at work as well as home now.  As usual with HP it's very well thought out and has the awesome button click. Very very happy
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28/08/2020 15:04
Ekomi Review
Thank goodness HP still make calculators that allow Reverse Polish!! It's a brilliant product. I have been using it constantly since it arrived. I'm an engineer.
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24/08/2016 07:13
Ekomi Review
Quality of product is as expected of HP.
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01/04/2016 07:13
Ekomi Review
Seems good quality-expect good durability.\nNicely packed and quick delivery.
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10/03/2016 06:13
Ekomi Review
Very good scientific calculator with a lot of functions.
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17/11/2015 06:13
Ekomi Review
I bought this calculator after my previous one found its way into the washing machine and refused to work again. I am a design engineer and have used HP Scientific calculators for the last 40 years - I think they are very good and wouldn't be without one wherever I am.
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19/09/2015 07:13
Ekomi Review
This is great RPN calculator at a very competitive price, make no mistake. One thing that could be improved is to attach English leaflet, since the two attached were in German and Italian. However, this lack in documentation does not make the calculator any worse, since proper manual can be viewed from attached CD (or downloaded) and is available in English.
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06/08/2015 07:13
Ekomi Review
Alwasy had HP calculators. Have never had a problem with any of them.
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24/03/2015 06:13
Ekomi Review
*****
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21/03/2015 06:13
Ekomi Review
Almost back to the classic HP
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21/01/2015 06:13
Ekomi Review
A step towards the original HP's
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14/01/2015 06:13
Ekomi Review
The unit is suitable for practicing engineers, no pointless bells and whistle.It was chosen because it is solidly built and has RPN.. (OK-I'm old!)
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01/08/2014 07:13
Ekomi Review
Based on my initial impressions I am impressed. I use it in my daily work as a chartered engineer carrying out design calculations. Not everything is done by computer even now!\n\nIt is best suited to profesions similar to mine, technical or scientifically based and students studying such subjects.\n\nHaving read some critical online comments I was pleased to find that the quality is very good. It is bigger than my trusty old 41-CX but slimmer and I particulary like the slip case. It'smuch lighter perhaps partly because of the batteries. The key presses and the keys I have found to be good, too early to tell if I will encounter problems with these as reported online.\n\nDisappointed that the printed quickstart guides were Italian and German language versions only, not even an English version on the CD. All the text on the package was in German too. It's not possible to fully exploit the calculator without the manual even if you are used to HP calculators and RPN. I had it printed by an online service and it cost almost 50% of the calculator price.\n\nIn summary, looks promising.
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25/11/2013 12:40
Ekomi Review
I an familiar with HP, only calculator I use
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07/11/2013 08:01
Ekomi Review
Recommend to all who is interested in math.
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