I have been looking for a calculator with this specific set of features for literally years. I've already bought another one because I'm so sick of finding the perfect thing and then I can't get a replacement 5 years later when the manufacturer has gone out of business. Hoping this review helps prevent the last part too. I've been using my TI-83 from school at my job because I simply couldn't part with the parentheses and ability to see multiple lines. However, I've also been wanting a calculator that can sit on my desk to run quick calculations without the 5 billion other functions a graphing calc has, and to see the display without picking it up. Unfortunately, every "large format" desk calculator is just the basic accounting one that I find too limiting in features. Printing calculators solve some of my problems since you can refer to past calculations and check your work, but I just hate using them. Above standard features are: 1) Multiple lines - ability to see what I typed in is CRITICAL so I can check my work, especially once you start doing more complicated calculations involving parentheses. Basically like tape printing calculator, but without the paper! 2) Parentheses - I don't know if it's my line of work, or just the way my brain works, but I find myself constantly dividing a sum of numbers by another sum of numbers, requiring parentheses if I don't want to write down the numerator and denominator. 3) Arrow left/right w/ insert & delete - many calculators have a backspace, but sure can be nice to not have to retype a whole equation if you left out a 0 in the first of several numbers. This feature is critically important with the next feature though. 4) Arrow up/down - this scrolls through past calculations. While this would be useful just to check work, you can actually also go back and edit/add/delete numbers and resolve. This is such big quality of life feature, I'm surprised it's not more common. The only improvements that I feel could be made: 1) More lines - I would actually prefer 4 or 5 lines, all a larger version of the 1st row. Again very similar to the TI calculators. 2) Reuse prev calculation as a variable - I know the memory function (MRC) serves the same purpose, but I find using it unintuitive. I much prefer the TI's ANS<2nd+(-)> feature so you can insert the previous result anywhere in your new equation. You can use the arrow up function of this one to find a previous calculation, but if you want to reuse it's result, it has to be at the front of the next equation you're using the result in. Not helpful if I'm trying to divide by a previous result. I guess since this calculator is already going out on limb they wanted to keep it as familiar as possible to the standard accounting desk calculator and it's memory button, but still hate it. 3) Water-resistant - Most probably don't need it, but we use large desk calculators in the lab since it's easy to hit the larger buttons with gloves on and doesn't matter if we spill (plus can be rinsed off in the sink), and easy to read while standing. The poor-man's solution is to put in a plastic ziplock, but it doesn't look professional and eventually gets dirty or tears. The Victor 99901 is our favorite calculator in the lab for those who need something similar: https://www.ZeeBooth.com/gp/product/B002XQ23IG/?th=1. This calculator's features would be great in a lab or other dirty setting. 4) Display could be angled a bit more. The LCD can be just a bit hard to see when the calculator is further from you and you're sitting.
