Summary: Mine came without batteries at all, inside the calculator or outside the package, even though it says: "Batteries 1 CR5 batteries required. (included)" Other than that, this is a quite decent calculator. The stats functions are a bit annoying to deal with, but they work. You just have to read the manual.
Summary: I have no need of calculators that graph or know the sine of a secant, or calculating the log of a log. It works really well for being more accurate than a slide rule. From this buyer, it came with a pretty good instruction manual, which I respect. Great value for the money.
I've owned many calculators, ultimately relied on HP because ...
20 July 2014
Summary: I've owned many calculators, ultimately relied on HP because of quality. This is not. It was used as a standby for a quick calculation and not very often. This simply stopped working after one year.
Summary: Another reviewer slammed this because it does not have the look and feel of the traditional HP calculator. Forget about him. This is a great inexpensive calculator. HP quality is not what it used to be anyway. I have one old HP-15C calculator that works beautifully and is 30 years old. Then I bought an HP financial calculator for $35 (an HP-10bII) and it broke after 1 year. Think of this HP-10s as a Japanese calculator with an HP label.
Summary: This is an excellent calculator. I use it as my first choice whenever I have to solve a scientific math, electrical, or general radio circuit or radio wave transmission problem. I bought three (3) different calculators at the same time -- because my older one died unexpectedly -- to prepare for an upcoming FCC Exam. I used it to pass my FCC Amateur Radio Technician, General, and Extra Exams.
Summary: Haven't had this calculator long enough to give a proper review. But so far so good. I prefer a white to a black background. Easier to see the extra functions above the buttons. On the display, it has dot matrix on top line and solid on bottom line. The solid line is easier to see. But dot matrix seems to be what most calculators are using. All of the four line calculators that I'm aware of use dot matrix. As well as most two line. The buttons work fine.