I bought my last Sharp calculator 17 years ago. It was my faithful companion through 5 years as a maths teacher and 12 years as a tutor. It patiently endured being poked by countless students and never failed to give the correct answer. It never needed a battery replacement and all its buttons worked up until the day of its death. I bought my second Sharp calculator about a month ago. So far it is living up to its predecessor's stellar example. If it keeps going, it might even outlive me.

Single-handedly the best calculator I've ever used. This calculator still surprises me to this day with what it can do. I've had the calculator since 2009 and I haven't used it in a couple of years...yet it still runs! The fact that it just turned on inspired me to write this review. If you're looking for perfection, get this calculator. It's programmable (sort of... you can save variable values and basically calculate entire formulae with different values with ease). It can calculate derivatives, definite integrals and anything below that level of math. It can probably do more, but I've yet to discover those features....

This series of Sharp Advanced D.A.L. calculators has been going strong for decades. I've had my old one since my GCSEs in 1998 (I got it 2nd hand) and only needed to replace it after I lost it when moving house. This newer model is much the same but with a slightly improved button layout and is "Recommended for GCSE" as well as being very easy to use and edit calculations and formulae in my daily work as an electrical engineer. I'm looking forward to another 23 years of service from this new one, although the white colour may need a clean or two in that time!