The item you selected has ended, but we found something similar.

Picture 1 of 9

Stock photo

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 1 of 9

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 2 of 9

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 3 of 9

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 4 of 9

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 5 of 9

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 6 of 9

Hewlett Packard HP 20s Scientific Calculator w Slip Case New Batteries Tested - Picture 7 of 9

HP 20s Scientific Calculator

4.6954 product ratings

Swindles Family Fantastic Finds (1138)
99.6% positive feedback

Price:

$23.24

Returns:

30 days returns. Buyer pays for return shipping.

Condition:

Used

This Hewlett Packard HP 20s Scientific Calculator is a reliable and efficient tool for any mathematician or scientist. It features a small LCD display and runs on battery power, making it a great choice for on-the-go calculations. The calculator comes with a slip case and has been tested to ensure that it is in working order. It is a handheld size and has a regular key size. The model number is 20s and it is manufactured in an unknown location. This calculator is perfect for business, industrial, or office use. Works great but a has a screen flaw in left hand side seen in pictures

About this product

Product Information

Get ready to solve difficult math equations, including algebraic equations, quickly and easily. The HP-20S programmable scientific calculator is a wonderful accessory for students. The 20S will take them from middle school pre-algebra through college calculus and more advanced science and mathematics courses. Young mathematicians will progress rapidly through algebra with the 20S thanks to its intuitive algebraic entry system. This allows students to enter data into the calculator algebraic notation, just as it appears in test or homework questions. This feature is especially useful when doing complex mathematical operations of solving equations that require many steps. After writing their work out on paper as required, students can check their work with the 20S. If the student has the wrong answer, they can input each step into the calculator to find the error.The HP-20S scientific calculator will continue to serve students well as they progress to higher mathematics courses. It will display up to 12 digits at a time. Advanced calculus students can take advantage of the formula button for Simpson's Rule of Integration. Data science students will save time with the 20S when they use the built-in curve fitting programs. The standard programs in memory also include quadratic formulas, 3x3 matrix operations, and complex mathematical operations. To access the program library in memory, press left shift key, delete key, load key. You can then use the letters A-F to access program groups. A calls the root finder. B is for numeric integral programs. Choose C for complex number arithmetic. D accesses matrices, and E is the quadratic equation solver. F is for exponential, logarithmic, and power regression functions.Business professionals can also find plenty of use for this scientific calculator, which comes with over 150 essential functions. Some the standard conversion features on the 20S include distance in centimeters to inches and mass in pounds to kilograms. Baking Continental recipes become a breeze with the built-in volume conversions like milliliters to teaspoons, tablespoons, or fluid ounces. Distance conversions while traveling is a snap, with the pre-programmed mile to kilometer conversion function. Fashionistas will find the pre-programmed size conversion feature, including centimeters to inches, which is handy when purchasing clothing in European sizes.Students will enjoy the ease of the root-finding feature and the quadratic formula shortcut. Trigonometric functions available at the touch of a key include sine, cosine, and tangent. Other essential math shortcuts already programmed in include exponential, log, and antilog keys. Students can also input their own equations and programs to this Hewlett Packard calculator with the programmable keystroke feature. This lets the student automate specific routine equations or programs for certain classes and topics. Many teachers allow students to store specific equations in their calculator's memory for use during tests. The HP-20S fits in a laptop case, briefcase, or purse, so it's always at hand when you need it. Even though the calculator has a compact size, the keys are not, making them easy to see and use. This calculator comes with a vinyl Hewlett Packard slipcase to protect it through the years and requires three LR44 batteries.

Product Identifiers

Brand
HP
MPN
HP20S
UPC
0088698000335
Model
20s
eBay Product ID (ePID)
54857029

Product Key Features

Power Source
Battery
Size
Handheld
Key Size
Regular
Type
Scientific

Additional Product Features

Display Type
Regular
Digit Display
12 Digits
Family Line
Pioneer

All listings for this product

4.7

4.7 out of 5 stars based on 54 product ratings

54 product ratings

41 users rated this 5 out of 5 stars
11 users rated this 4 out of 5 stars
1 users rated this 3 out of 5 stars
0 users rated this 2 out of 5 stars
1 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

See all 43 reviews

4 out of 5 stars
by hudendaiJan 28, 2009
Hewlett Packard HP 20S Scientific Calculator
The HP 20S is an excellent Calculator. It is a do-it all scientific calculator, and despite being Algebraic Entry is very useful and compact. The button feel and accuracy are very attractive features of this calculator. *Self test by Pressing the [C] key and [y^x]. Press any key and begin the keyboard test left to right and top to bottom. *Reset by pressing [C] and [LN]. If you're looking for RPN, buy the HP32sii- they look very similar, but inside they are not. The 32sii costs twice as much, but is worth it. Related Calculators: The 20S is a part of the Pioneer Series of HP calculators made from 1989 until 2000 or 2001. The Pioneer 10-series contained the Business Calculators: the HP 10b, 14b, 17b, 17bii. The Pioneer 20-series contained the scientific (algebraic) calculators including the 20S, 21S (Statistics), 22S and 27S. Lastly, the Pioneer 30 and 40 series contained the high-end RPN scientific series: 32S, 32sii, and the 42S.Read full review
3 out of 5 stars
by captainclock12Oct 07, 2012
I wouldn't recommend this calculator for school use, get a TI-30X for that.
The Hewlett Packard Scientific Calculator Model 20s was their more "middle of the road" model that was first released mid-year 1986, but has a copyright of 1987 on the back. Which has to do with the fact that when Hewlett Packard released a new model calculator they released it mid year for the next model year like car companies did with their cars. But unlike car companies the model could go unchanged for years until they discontinued the model and replaced it with a new one. This particular calculator went unchanged all through its long lifespan, being discontinued in 1993, and being replaced with the 38s in 1994 which is still being made to this day, with some minor cosmetic changes from the original and a 2-line screen whereas the original only had a single-line screen like this one and a fraction bar button. Like I stated earlier this was the poor-man's scientific calculator being only priced in at around $99 ($200 in today's money) vs. the 28s scientific calculator that they made at the same time which was the top of the line scientific calculator that HP made at that time which would of cost around $300 ($608 in today's money.) This calculator has many useful features and also lacks many useful features as well. For example this particular model calculator featured various conversions (e.g. centimeters to inches, or kilograms to pounds etc.) which is a very nifty and handy feature for when you need to convert measurements for work or school. One of the features it lacked that would of been nice for it to of had was a fraction bar button. Which it was rather odd that HP left out that feature on this calculator because the Texas Instruments TI-30X Calculator (which was Texas Instruments' equivalent of this calculator) had a fraction bar button with it. Which was what confused me when I looked up the specs on this calculator because at first I thought I might of just not been looking in the right spot for it or that it might of just looked different than the Texas Instruments version of the fraction bar button, but nope that wasn't the case, they just never included it. So in all practicality this calculator is pretty much "you get what you pay for" so to speak, and that is a "cheap, basic calculator that basically fits the needs of the everyday Joe that just needed a scientific calculator for school or work but didn't want to pay a premium price to get one. Its amazing to think that this basic featured scientific calculator cost $100 when it was brand new back in 1987 when now a days you can pay only $20 for one now and even still have all of the features that this one didn't even have. Another discouraging feature of this calculator is the fact that it takes 3 "357" button cell batteries which can get kind of costly to replace especially when a 3 pack of "357" button cells costs as much as a 24-pack of "AA" batteries, which means that its not very economical to power this calculator vs. the Texas Instruments equivalent of this calculator the TI-30X which ran off of 2 "AA" batteries, and had just as many features as this calculator had for the same price back then. I probably wouldn't of bought this calculator back then. The only reason why I bought this was because I wanted to have a HP calculator in my collection, and I couldn't justify the 28s because people on here was asking $500+ for them, and it wasn't worth it for a "cool calculator" to add to my collection and to use at school for the "throwback" effect.Read full review
4 out of 5 stars
by lucky_forwardDec 29, 2009
Solid basic scientific calculator.
This is a very sturdy and well mad calculator. The keys are crisp and solid. The markings are very easy to read. I have only just begun using it. I used to have a 48GX and am preferential to the RPN style input. This uses algebraic. It's a fine inexpensive calculator. I have not used any of the programming functions.
5 out of 5 stars
by skwalebabaOct 03, 2006
HP-20S Scientific calculator
The HP-20s is a great calculator. It features easy-to-use algebraic entry and a built-in program library of over 100 built-in scientific and mathematical functions. This powerful built-in program library eliminates the need to input frequently-used functions such as root finder, Simpson’s Rule of integration, complex number operations, 3x3 matrix operations, quadratic formula, and curve fitting programs. When using the HP-20s, these features are available at the touch of a key. Essential trig and math functions for scientific applications are of course available. Sine, cosine and tangent, or exponential, natural log and antilog functions are only a few of the functions that can be used with the 20s. The HP-20s performs English / metric conversions and fast conversions for mass, distance, volume and temperature. Introduced in 1989, this calculator belongs to the last rock solid series of calculators produced by Hewlett-Packard at the end of 90's. You can place it in the pocket of your shirt and forget about it. Thin, light and efficient, you will appreciate its black stylish dress! HP made its name on calculators and this model is one of those that reminds us why!!! The HP-20S has been produced first in USA and Singapor (we can identify it because it shows 5 rubber feet on the back) and secondly in Indonesia (this one shows 3 rubber feet only on the back). The american and singaporian models are the one to look for, particularly if you are a collector (USA one is the best). Keep an Indonesian model if you like variations.Read full review
5 out of 5 stars
by blairl2704Jul 09, 2016
HP 20S scientific calculator
Very robust, reliable, algebrai function, touch sense keys, great layout, raised keys, easily fits into a shirt pocket, comprehensive manual. Purchased as a backup when my first one "dies".
Verified purchase: Yes
4 out of 5 stars
by 1978widgetSep 27, 2017
Spot on.
All though the description of the calculator's condition was as stated "Mint", was entirely true. You couldn't ask for a better price. I was extremely disappointed in the packaging. Simple bubble wrap envelope, to protect a "Mint condition" calculator, is not sufficient. All that said beautiful product and short arrival time is a plus.
Verified purchase: Yes | Condition: Pre-owned
5 out of 5 stars
by cjaym1Jul 03, 2008
best,easiest, scientific, Sorry it's not made any more
Been using the HP 20S for 20 years now, Found there is no other match in the scientific Caluculator, The Metric conversion is just one operation. Really sorry HP stop making these. I own a machine shop and buy about 10 of these a year for my employees. We have tried so many different types none match the HP 20s. Problem is once was $35 for a new one, a used one can cost as much as $100
5 out of 5 stars
by aaschn62Sep 16, 2022
Unit WAS in original clam shell packaging with manual still shrink wrapped.
I absolutely love it. The heft and "key feel" are unavailable on calculators in the current market.
Verified purchase: Yes | Condition: Pre-owned
5 out of 5 stars
by tsebitahiJul 31, 2018
Calculator overview
Calculator is in excellent condition, clear display, and limited keypad operations. Most of the keypad is functional except the + - * + buttons.
Verified purchase: Yes | Condition: Pre-owned
5 out of 5 stars
by altorogeJul 23, 2019
Excellent Product Description
Replacing an old calculator that I had for 20 years. Good quality and value.
Verified purchase: Yes | Condition: Pre-owned

Best Selling in Calculators

See all

Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Best Selling in Calculators

Texas Instruments TI-84 Plus CE Graphing Calculator - Black
4.9 out of 5 stars based on 27 product ratings
$64.99 New
$42.99 Used
Texas Instruments TI-84 Plus Graphing Calculator 10-Digit LCD
4.1 out of 5 stars based on 28 product ratings
$23.11 New
$9.99 Used
Texas Instruments TI-84 Plus Graphing Calculator - Black (84PLCE/TBL/1L1/AH)
4.8 out of 5 stars based on 18 product ratings
$99.95 New
$12.63 Used
Texas Instruments 84 Plus CE Graphing Calculator - Bright White
5.0 out of 5 stars based on 2 product ratings
$64.99 New
$44.99 Used
Texas Instruments TI-84 Plus Graphics Calculator - Black (‎84PL/TBL/1L1/H)
4.7 out of 5 stars based on 15 product ratings
$60.00 New
$24.97 Used
Casio fx-9750GIII Graphing Calculator - Black
4.7 out of 5 stars based on 34 product ratings
$32.99 New
$18.00 Used
Casio FX-CG50 Graphing Calculator - Black
4.9 out of 5 stars based on 81 product ratings
$82.95 New
$24.00 Used

Save on Calculators

Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Save on Calculators

Texas Instruments TI-84 Plus CE Python Graphing Calculator Fastship
$89.00
Trending at $90.00
BRAND NEW Casio fx-9750GIII Graphing Calculator - Black
$24.99
Trending at $29.98
NEW SEALED NO BOX Texas Instruments TI-83 Plus Graphing Calculator
$43.96
Trending at $50.50
Casio FX-300ESPLS2-S 2nd Edition Scientific Calculator, 12-Digit Natural Display
$6.93
Trending at $10.95
Hewlett Packard HP 12C Financial Calculator NOS Sealed Packaging
$20.00
Trending at $29.99
Texas Instruments TI-30XIIS Scientific Calculator
$5.50
Trending at $10.99

Picture 1 of 9

HP 20s Scientific Calculator

About this product

Product Information

Product Identifiers

Product Key Features

Additional Product Features

All listings for this product

Ratings and Reviews

Most relevant reviews

Hewlett Packard HP 20S Scientific Calculator

I wouldn't recommend this calculator for school use, get a TI-30X for that.

Solid basic scientific calculator.

HP-20S Scientific calculator

HP 20S scientific calculator

Spot on.

best,easiest, scientific, Sorry it's not made any more

Unit WAS in original clam shell packaging with manual still shrink wrapped.

Calculator overview

Excellent Product Description

Best Selling in Calculators

Save on Calculators

You may also like