CASIO fx-991CW

[lrdheat]

Thanks for the review. I had incorrectly believed that stats data was lost upon turning the calculator off. I had tested it, and was happy to see that the data was retained when switching through apps, but refrained from using the stats for uses that required new entries through the course of days (such as daily high/low temperatures as a month progresses).

There are some difficulties with the calculator finding roots of an equation when the root is at a discontinuity or when the slope at the root location is infinite, but I am quite happy with this gem. With the extra internal significant digits, results that appear in decimal form on other calculators (even the 991 EX) that are clearly recognizable as a fractional result are often presented in fractional form.