HP-20S Scientific Calculator

The HP-20S Scientific Calculator is a reliable and user-friendly calculator designed for students, engineers, and science professionals who need fast access to complex mathematical and statistical functions. Featuring a straightforward algebraic entry system, a built-in library of 100 scientific equations, and programmable capabilities, the HP-20S delivers precision and versatility in a compact, easy-to-carry form. Its robust performance and durable design make it an excellent companion for both classroom and field use.

Product Features: 

• Algebraic Entry System – Familiar and easy for students and general users
• 100-Built-In Equations – Access formulas for physics, math, engineering, and statistics
• Programmable Memory – Store up to 99 program lines for repetitive calculations
• Advanced Math Functions – Includes trigonometry, logarithms, powers, roots, and factorials
• Statistics Mode – Perform mean, standard deviation, linear regression, and more
• Complex Number Support – Handle real and imaginary components in calculations
• Fraction & Decimal Conversions – Easily switch between number formats
• Two-Line LCD Display – Shows entries and results for improved usability
• Compact & Lightweight Design – Durable and portable for students and professionals
• Battery Operated (2 x CR2032) – Long-lasting performance with user-replaceable batteries

Note: This is a refurbished item that comes with a 90-day exchange warranty. This has been serviced and calibrated to work as new. Servicing can include replacement of belts, gears, capacitors, cleaning and re-lubricating all internal mechanisms. Porter Electronics prides itself on only acquiring top quality used products that show minimal signs of use. Buying from Porter Electronics you should expect a very nice, refurbished unit. We do offer an extended warranty that can be purchased during checkout and will apply at the end of our already 90-day warranty

Porter Electronics also offers free tech support for those needing extra help. We offer a free digital download of the manual for this on this page in the “Downloads” tab. If you are unable to locate the link, just use our Contact Us page to request one.