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11 Oct, 2017
Great calculator
1 of 1 found this helpful My 30-year old HP28C died recently, the best calculator ever, except for the 28S upgrade, which has more RAM, so I was happy to find the 28S online used, and seems in great condition, manuals as well. I can't possibly list a fraction of the features of the calculator, but having a full alphabet keyboard is great even if you have to get used to it being in alphabetical order. A friend said no one needs calculators since phone apps can do it all, but that's simply not true, and having a dedicated calculator is simply more convenient than finding apps, and friendlier than touch screen buttons.