---
product_id: 48260156
title: "HP 35S/B12 Scientific Calculator, Black"
brand: "hp"
price: "₪9"
currency: ILS
in_stock: true
reviews_count: 6
url: https://www.desertcart.co.il/products/48260156-hp-35s-b12-scientific-calculator-black
store_origin: IL
region: Israel
---

# 0.73 year battery life 800 memory registers 100+ built-in functions HP 35S/B12 Scientific Calculator, Black

**Brand:** hp
**Price:** ₪9
**Availability:** ✅ In Stock

## Summary

> 🧮 Elevate your calculations—because precision is the new power move.

## Quick Answers

- **What is this?** HP 35S/B12 Scientific Calculator, Black by hp
- **How much does it cost?** ₪9 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.il](https://www.desertcart.co.il/products/48260156-hp-35s-b12-scientific-calculator-black)

## Best For

- hp enthusiasts

## Why This Product

- Trusted hp brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual-Mode Entry System:** Switch seamlessly between RPN and algebraic logic to match your workflow and boost efficiency.
- • **Ready for the Long Haul:** Powered by dual CR2032 batteries with nearly a year of life at 1 hour daily use—dependability you can count on.
- • **Precision at Your Fingertips:** 100+ built-in functions tailored for engineering, science, and medicine ensure flawless calculations every time.
- • **Crystal Clear Two-Line Display:** Adjustable contrast LCD with 2 lines x 14 characters keeps your calculations visible and error-free.
- • **Memory That Works as Hard as You Do:** 800 memory registers and 30KB user memory let you store complex data and formulas effortlessly.

## Overview

The HP 35S/B12 Scientific Calculator is a professional-grade tool designed for engineers, scientists, surveyors, and medical professionals. Featuring over 100 built-in functions, 800 memory registers, and a 30KB user memory, it supports both RPN and algebraic entry systems. Its two-line adjustable LCD display and long-lasting dual CR2032 battery power ensure reliable, accurate performance in demanding environments.

## 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. Find more at

## Features

- Best used for: Engineering; Surveying; Science; Medicine Built-in functions: 100+ Memory registers: 800
- Memory: 30 KB Power: 2 x CR2032 batteries; battery life: 0.73 year @ 1 hr/day (approximately 9 Display: LCD with 2 lines x 14 characters; adjustable contrast
- Dimensions (W X D X H): 3.23 x 0.72 x 6.22 in Weight: 4.4 oz. What's in the box: Calculator, batteries, user manual, premium protective case

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | HP |
| Model Number | HP-35S/B12 |
| Colour | Black |
| Product Dimensions | 30.48 x 20.32 x 0.25 cm; 133.24 g |
| Material | Plastic |
| Item Weight | 133 g |

## Product Details

- **Brand:** HP
- **Colour:** Black
- **Calculator Type:** Engineering/Scientific
- **Power source:** Battery Powered
- **Screen size:** 1
- **Number of batteries:** 1 Lithium Metal batteries required. (included)
- **Model name:** HP 35S
- **Material:** Plastic
- **Product dimensions:** 15.8L x 8.2W centimetres
- **Display type:** LCD

## Images

![HP 35S/B12 Scientific Calculator, Black - Image 1](https://m.media-amazon.com/images/I/7182O2jBWLL.jpg)
![HP 35S/B12 Scientific Calculator, Black - Image 2](https://m.media-amazon.com/images/I/71H7O4mJWYL.jpg)
![HP 35S/B12 Scientific Calculator, Black - Image 3](https://m.media-amazon.com/images/I/71F3haWJovL.jpg)

## Available Options

This product comes in different **Item Package Quantity** options.

## Questions & Answers

**Q: Can I introduce big texts?**
A: Only one letter variables are allowed but you can type words in the equation editor EQN

**Q: How many programme steps? Does it have normal, binomial & Poisson distributions? Can it calculate the median or do any statistical tests?**
A: The HP35S is a tribute version of the HP35, the first HP pocket calculator which I saw at university when it first came out - it blew a considerable portion of the department budget.  Accordingly, it is a simple RPN calculator built on more recent electronics which far exceed the design limitations of the original HP35, although the functionality is the same.

The number of program steps is difficult to quantify, as it is dependent on what is programmed, but a data variable uses up to 37 bytes (type indicator and 3 floating point variables for a single vector). With 30Kbytes of user memory, this is unlikely to be an issue!  As there is no card reader (unlike say, the HP41 or even the venerable HP67), the length of program entered (and more importantly re-entered) is limited by usability considerations.

The statistics menus in the HP 35s provide functions to statistically analyze a set of one– or two–variable data(real numbers):
Mean, sample and population standard deviations.
Linear regression and linear estimation 
Weighted mean (x weighted by y).
Summation statistics: n, Σx, Σy, Σx2, Σy2, and Σxy.

You could program it to handle solutions for other distributions, but the lack of card reader puts a limitation on loading and reloading complex applications in the field - which is why I still prefer the HP41 over later machines like the HP48.

**Q: 35s and 35s/B12 - what's the difference?**
A: Sorry I don't know, but my guess is they are the same.

**Q: Introduce text**
A: Use the RCL button then type the letter in red on the bottom right of the keys. Only single letter variables are allowed but you can type words in the equation editor EQN.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Almost perfect and amazing value
*by A***E on 25 November 2020*

Despite having a couple of HP calculator emulations on my iPhone, it somehow isn't the same. My "every day" calculator (HP 42s) was beginning to play up, getting increasingly difficult yo read the display, so time for a new one. In general the HP35s is better in nearly every way – particularly in flexibility and ease of use, and it is AMAZING value – I paid over £100 for my HP42s over 30 years ago!There are only a couple of niggles; conversion from litres to gallons (and back) is in US gallons only. This is mildly irritating as we buy petrol in litres, but then work out mileage in miles per gallon. It isn't a difficult calculation, but having it teasingly built in is annoying.My only other complaint is that I wish it was built to the same standard of HP calculators from the 1970s and 80s, it just feels a bit plasticy. I would happily pay more for better plastics and an olde style soft click of the buttons of yesteryear.As to RPN, it is clearly better, easier, more efficient, more logical and elegant than algebraic entry (as 100% of people who know and use RPN will agree), but for those too timid to dip their toes in the RPN pool, it can work algebraically too.

### ⭐⭐⭐⭐⭐ Classic HP Reverse Polish Notation Scientific Calculator.
*by J***C on 24 November 2017*

Superb HP RPN (Reverse Polish Notation) calculator. Fully programmable, in fact that's the main point of it. Can be used as a standard scientific calculator, but you'll have to learn to use RPN as this is not an algebraic calculator. You want to find the Sine of 45 degrees, you need to type 45 then hit Sin. You want to do the squareroot of (123+343-32) you press 123, enter, 343, add, 32, subtract, squareroot. You don't use brackets with RPN, it's quicker with complex embedded problems, when you have invested a couple of hours to really get used to it. Wonderful HP manuals available for download. Enjoy learning this powerful beast. Understated. You feel like you are programming something from 1983, which is part of the nostalgic joy of HP calculators. Thank goodness they still make them. A calculator with soul for those with a brain.

### ⭐⭐⭐⭐ It does the job
*by S***W on 26 August 2019*

I'm slowly getting my head around what it can do. As a scientific calculator is does the job. RPN is much quicker than the more traditional algebraic method and it can be switched between the two modes. I bought it for the RPN functionality which is generally quicker. It's also programmable which is a nice feature although limited to 32K and there is no way to save the programs to an external stroage device. If you need that functionality see the Swissmicro calculators. . I like the solid, quality design and the keys feel good. There are lower cost and much cheaper scientific calculators out there but this ones strikes a nice balance for me in terms of quality, what I need it for and speed of operation. It included a quick starter guide in both English and French, 2 x CR2032 batteries and a nice sleeve case. There was also a CDROM (never used) containing the full manual which can also be downloaded from the HP web site.

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*Product available on Desertcart Israel*
*Store origin: IL*
*Last updated: 2026-02-22*