HP HP20S Scientific Calculator Review

Average Reviews:

(More customer reviews)This is, quite simply, the best algebraic-notation calculator short of the graphical types.How is it superior?Let me count the ways:
1. It has a 12-digit display, but it's not limited to 12 digits.If it needs more display room, it will scroll.
2. It uses commas for thousands separators.
3. It has the easiest-to-use percentage calculations I've ever used.
4. The display shows "PEND" when you've hit an operator key (+, -, etc.) and it's waiting for the operand.This is great when you're doing involved calculations interspersed with thinking or looking info up.With other calculators, you come back from your diversion and have to think about whether you hit the operator key yet or not.Worse, some calculators change their behavior if you hit an operator key more than once, so you can't hit the operator key again without consequences.
5. It's built really well, and the keys have a nice tactile feedback.
6. There are several other nice features, but I'm running out of space.Suffice it to say, whoever designed this calculator knew how to make it pleasant to use as well as functional.Most other calculators are either too simple to be useful or too complicated to be useful.The HP20S strikes the right balance for me.I have two now and would buy a 3rd in a heartbeat if I could find one, just to have a spare, just in case.

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Product Description:
A comprehensive scientific calculator, the Hewlett-Packard HP20Sfeatures easy-to-use algebraic entry and a built-in program library of over 100scientific and mathematic functions. The library has frequently used functionslike root finder, Simpson's rule of integration, complex number operations, 3x3matrix operations, quadratic formula, and curve-fitting programs--all at thetouch of a key. The HP20S also has essential trigonometry and math functionssuch as sine, cosine, tangent, exponential, and natural log and antilogfunctions.
With this calculator, you can also perform English/metricconversions and fast conversions for mass, distance, volume, and temperature.And with the algebraic entry system, you can enter algebraic notations just asyou would write them down on paper (a terrific time saver). For calculations youdo routinely, the HP20S can record your keystrokes for future use--a greatfeature when you are working on a long-term project or set of calculations thatyou'll need to access repeatedly.
This is an ideal tool for students orprofessionals in the sciences and mathematics, and with its small size, theHP20S conveniently slips into a backpack or briefcase for easy transport. --Dana Van Nest