Hewlett Packard 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.