![]() Those are to satisfy my geeky side, I love just playing with them and learning what they're about, but for serious use, I've found the HP 15C, HP 35s and DM42 are all much better - though how much of that is simply that those are what I have spent more time on, I can't really answer. HP 300s+ Scientific Calculator with advanced arithmetic, algebraic and trigonometric functions to tackle math & scientific courses. I also have a Platinum HP 15C, a HP 12C, which also has been mostly replaced by spreadsheets for my needs, and some other Swiss Micros calculators. I'm really enjoying the power it has, though I mostly baby it with really simple work compared to what it can do. Screen contrast feature Pocket-sized, take it anywhere 31k user memory Edit, undo & delete capability RPN and algebraic data-entry modes HP solve. RPN is usually more efficient than Algebraic. Delivers a large two-line alphanumeric display with adjustable contrast, raised edges to. And it helps that I also have Free42 on my phone and desktop for when it is impractical to carry extra gadgets. The HP 35s has two operating modes: Reverse Polish Notation. Each Information Choice of RPN or Algebraic entry system logic. Since I never used the HP 41 series, I find the 42 to be really nice. I find the keyboard to be as nice, if not nicer, the display is simply outstanding, and the capability is magnificent. However, once I got my DM42, that replaced the HP 35s for everything. Nothing I ever used for heavier calculations, since like the HP 15C, it has no way to import or export programs or data. I kept it on my desk when I was doing industrial programming and technical sales for the occasional quick calculation, and it was admirably suited for that. It's really relegated to when I just want to calculate something small, though I often reach for my cellphone and Free42 for that now. The HP 35s has two operating modes: Reverse Polish Notation (RPN) and Algebraic mode (ALG). The bandwith of the interface is just not there for solving large problems with lots of data, though I used to do that in the early 90's. However, it has largely been replaced by tools like NumPy and Gnumeric for when I need more complex solutions these days. I started with an HP 15C ages ago, and it remains my handy companion when I am at home and have to do something, or when I work serious math. But since I have several of the calculators in question, I figured my answer might have some use. ![]()
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