I would think this calculator has a don't sell after this date printed somewhere like spoiled food
14 December 2014
Summary: since the batteries were dead upon arrival I wish I could give this Zero Stars. I don't relish pushing keys in vain, nor do I appreciate buying batteries for what was supposed to be a working calculator. I would think this calculator has a don't sell after this date printed somewhere like spoiled food. But alas someone or thing has gone amiss!
Summary: I am very happy with my newly-purchased EL-506 Sharp scientific calculator. Compared to the more expensive (and identical-sized) TI 30X IIS, the very important First-function keys on the Sharp EL-506 are: "Exp" "RCL" STO" "M+" even "X^3" . . . In addition, you can store FOUR equations in the F1, F2, F3, F4 memories to recall later. I love the simplicity of the TI 30X IIS, but I HATE the asterisk * used to denote "x" for multiplication. It bugs me to no end.
Summary: I am in the engineering field and use a calculator all day, everyday. I had the previous model to this one and loved it. The DMS to DD is the one thing Sharp has that I have trouble finding on any other calculator. This is a duplicate of my original Sharp except for the case. Love the calculator, hate the case! The case is hard to open and close.
Summary: No POS is not a math term. This calculator is a piece of #$%^. Unless you are an engineer or have access to someone who can explain to you why when squaring the sum of two exponents you need a bevy of parentheses you are wasting your time with this. The manual is pretty much a joke being that nothing is explained to any degree. For what it it worth you are better off buying a graphing calc for anything real and a simple calc with DMS for trig.
Summary: Well, it worked for sixteen months before numeric keys 5 and 6 stopped working -- four months beyond the warranty limit. When comparable Sharp calculators were still made in Malaysia they were excellent. Granted, this one may have more features but what good is it with two bad keys? I probably will not buy the Sharp brand again if I have a decent alternative.